java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/seq_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 05:05:38,458 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 05:05:38,460 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 05:05:38,476 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 05:05:38,476 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 05:05:38,478 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 05:05:38,481 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 05:05:38,483 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 05:05:38,487 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 05:05:38,488 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 05:05:38,490 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 05:05:38,490 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 05:05:38,492 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 05:05:38,493 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 05:05:38,494 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 05:05:38,494 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 05:05:38,503 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 05:05:38,504 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 05:05:38,509 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 05:05:38,513 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 05:05:38,515 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 05:05:38,516 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 05:05:38,520 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-11-07 05:05:38,531 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-11-07 05:05:38,558 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 05:05:38,559 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 05:05:38,559 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 05:05:38,560 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 05:05:38,560 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 05:05:38,560 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 05:05:38,560 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 05:05:38,560 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 05:05:38,561 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 05:05:38,561 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 05:05:38,561 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 05:05:38,562 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-07 05:05:38,562 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 05:05:38,563 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 05:05:38,563 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 05:05:38,563 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 05:05:38,563 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 05:05:38,563 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 05:05:38,563 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 05:05:38,565 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 05:05:38,565 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 05:05:38,565 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 05:05:38,566 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 05:05:38,566 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 05:05:38,566 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 05:05:38,566 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 05:05:38,566 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 05:05:38,567 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 05:05:38,567 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 05:05:38,567 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 05:05:38,567 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 05:05:38,567 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 05:05:38,568 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 05:05:38,568 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 05:05:38,617 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 05:05:38,629 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 05:05:38,632 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 05:05:38,634 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 05:05:38,634 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 05:05:38,635 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/seq_true-unreach-call_true-termination.i [2018-11-07 05:05:38,693 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/568dbe623/ac8a7e34b9424f34afe59369c1192c5b/FLAGf5def7d35 [2018-11-07 05:05:39,138 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 05:05:39,139 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/seq_true-unreach-call_true-termination.i [2018-11-07 05:05:39,146 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/568dbe623/ac8a7e34b9424f34afe59369c1192c5b/FLAGf5def7d35 [2018-11-07 05:05:39,162 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/568dbe623/ac8a7e34b9424f34afe59369c1192c5b [2018-11-07 05:05:39,173 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 05:05:39,175 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 05:05:39,176 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 05:05:39,176 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 05:05:39,179 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 05:05:39,180 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,183 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2228132a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39, skipping insertion in model container [2018-11-07 05:05:39,183 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,194 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 05:05:39,218 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 05:05:39,432 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 05:05:39,436 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 05:05:39,461 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 05:05:39,479 INFO L193 MainTranslator]: Completed translation [2018-11-07 05:05:39,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39 WrapperNode [2018-11-07 05:05:39,480 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 05:05:39,481 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 05:05:39,481 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 05:05:39,481 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 05:05:39,490 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,495 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,500 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 05:05:39,501 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 05:05:39,501 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 05:05:39,501 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 05:05:39,509 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,509 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,510 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,510 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,513 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,519 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,521 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... [2018-11-07 05:05:39,522 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 05:05:39,523 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 05:05:39,523 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 05:05:39,523 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 05:05:39,524 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 05:05:39,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 05:05:39,658 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 05:05:39,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 05:05:39,659 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 05:05:39,659 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 05:05:39,659 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 05:05:39,659 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 05:05:39,659 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 05:05:40,039 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 05:05:40,040 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 05:05:40 BoogieIcfgContainer [2018-11-07 05:05:40,040 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 05:05:40,041 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 05:05:40,041 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 05:05:40,044 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 05:05:40,045 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 05:05:39" (1/3) ... [2018-11-07 05:05:40,045 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@327ca858 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 05:05:40, skipping insertion in model container [2018-11-07 05:05:40,046 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:05:39" (2/3) ... [2018-11-07 05:05:40,046 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@327ca858 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 05:05:40, skipping insertion in model container [2018-11-07 05:05:40,046 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 05:05:40" (3/3) ... [2018-11-07 05:05:40,048 INFO L112 eAbstractionObserver]: Analyzing ICFG seq_true-unreach-call_true-termination.i [2018-11-07 05:05:40,059 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 05:05:40,067 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 05:05:40,086 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 05:05:40,129 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 05:05:40,130 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 05:05:40,130 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 05:05:40,130 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 05:05:40,130 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 05:05:40,130 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 05:05:40,131 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 05:05:40,131 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 05:05:40,150 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2018-11-07 05:05:40,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 05:05:40,157 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:40,158 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:40,160 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:40,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:40,166 INFO L82 PathProgramCache]: Analyzing trace with hash 301890663, now seen corresponding path program 1 times [2018-11-07 05:05:40,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:40,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:40,216 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:40,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:40,216 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:40,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:40,283 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:40,285 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 05:05:40,285 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 05:05:40,286 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 05:05:40,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 05:05:40,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 05:05:40,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 05:05:40,306 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2018-11-07 05:05:40,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:40,328 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2018-11-07 05:05:40,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 05:05:40,330 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-11-07 05:05:40,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:40,340 INFO L225 Difference]: With dead ends: 45 [2018-11-07 05:05:40,340 INFO L226 Difference]: Without dead ends: 23 [2018-11-07 05:05:40,344 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 05:05:40,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-11-07 05:05:40,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-11-07 05:05:40,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-11-07 05:05:40,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2018-11-07 05:05:40,386 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2018-11-07 05:05:40,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:40,387 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2018-11-07 05:05:40,387 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 05:05:40,387 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2018-11-07 05:05:40,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-07 05:05:40,388 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:40,388 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:40,389 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:40,389 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:40,389 INFO L82 PathProgramCache]: Analyzing trace with hash 1130037681, now seen corresponding path program 1 times [2018-11-07 05:05:40,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:40,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:40,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:40,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:40,391 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:40,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:40,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:40,574 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 05:05:40,574 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-11-07 05:05:40,574 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 05:05:40,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 05:05:40,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 05:05:40,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-11-07 05:05:40,577 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 7 states. [2018-11-07 05:05:40,999 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-11-07 05:05:41,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:41,053 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2018-11-07 05:05:41,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 05:05:41,054 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-11-07 05:05:41,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:41,057 INFO L225 Difference]: With dead ends: 48 [2018-11-07 05:05:41,058 INFO L226 Difference]: Without dead ends: 35 [2018-11-07 05:05:41,059 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-11-07 05:05:41,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-11-07 05:05:41,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2018-11-07 05:05:41,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-11-07 05:05:41,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2018-11-07 05:05:41,072 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 19 [2018-11-07 05:05:41,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:41,073 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2018-11-07 05:05:41,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 05:05:41,073 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2018-11-07 05:05:41,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-11-07 05:05:41,074 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:41,074 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:41,074 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:41,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:41,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1499928661, now seen corresponding path program 1 times [2018-11-07 05:05:41,075 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:41,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:41,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:41,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:41,077 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:41,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:41,168 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:41,168 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 05:05:41,172 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-07 05:05:41,172 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 05:05:41,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 05:05:41,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 05:05:41,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-07 05:05:41,175 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 6 states. [2018-11-07 05:05:41,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:41,286 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2018-11-07 05:05:41,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 05:05:41,286 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2018-11-07 05:05:41,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:41,287 INFO L225 Difference]: With dead ends: 42 [2018-11-07 05:05:41,288 INFO L226 Difference]: Without dead ends: 40 [2018-11-07 05:05:41,288 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-11-07 05:05:41,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-11-07 05:05:41,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2018-11-07 05:05:41,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-11-07 05:05:41,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2018-11-07 05:05:41,296 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 21 [2018-11-07 05:05:41,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:41,296 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2018-11-07 05:05:41,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 05:05:41,297 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2018-11-07 05:05:41,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 05:05:41,298 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:41,298 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:41,298 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:41,299 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:41,299 INFO L82 PathProgramCache]: Analyzing trace with hash -1355895601, now seen corresponding path program 1 times [2018-11-07 05:05:41,299 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:41,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:41,300 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:41,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:41,300 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:41,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:41,576 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:41,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:41,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:41,578 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 30 with the following transitions: [2018-11-07 05:05:41,580 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [20], [26], [30], [34], [36], [40], [44], [50], [52], [57], [60], [62], [65], [67], [68], [69], [70], [72], [73] [2018-11-07 05:05:41,640 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-07 05:05:41,640 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 05:05:42,402 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 05:05:42,403 INFO L272 AbstractInterpreter]: Visited 24 different actions 235 times. Merged at 8 different actions 93 times. Widened at 3 different actions 17 times. Found 7 fixpoints after 2 different actions. Largest state had 12 variables. [2018-11-07 05:05:42,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:42,441 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 05:05:42,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:42,442 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:42,460 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:42,460 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:05:42,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:42,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:42,942 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:42,942 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:43,195 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:43,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:43,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2018-11-07 05:05:43,218 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:43,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 05:05:43,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 05:05:43,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2018-11-07 05:05:43,219 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 14 states. [2018-11-07 05:05:43,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:43,549 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2018-11-07 05:05:43,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 05:05:43,550 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2018-11-07 05:05:43,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:43,554 INFO L225 Difference]: With dead ends: 64 [2018-11-07 05:05:43,554 INFO L226 Difference]: Without dead ends: 47 [2018-11-07 05:05:43,555 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 48 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2018-11-07 05:05:43,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-11-07 05:05:43,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 37. [2018-11-07 05:05:43,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-07 05:05:43,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-11-07 05:05:43,563 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 29 [2018-11-07 05:05:43,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:43,564 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-11-07 05:05:43,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 05:05:43,564 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-11-07 05:05:43,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 05:05:43,565 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:43,565 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:43,566 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:43,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:43,566 INFO L82 PathProgramCache]: Analyzing trace with hash 95654235, now seen corresponding path program 1 times [2018-11-07 05:05:43,566 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:43,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:43,568 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:43,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:43,568 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:43,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:43,708 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:43,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:43,708 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:43,708 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 30 with the following transitions: [2018-11-07 05:05:43,709 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [20], [22], [26], [30], [34], [40], [44], [50], [52], [57], [60], [62], [65], [67], [68], [69], [70], [72], [73] [2018-11-07 05:05:43,711 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-07 05:05:43,711 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 05:05:44,014 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 05:05:44,014 INFO L272 AbstractInterpreter]: Visited 24 different actions 253 times. Merged at 11 different actions 111 times. Widened at 4 different actions 19 times. Found 7 fixpoints after 2 different actions. Largest state had 12 variables. [2018-11-07 05:05:44,053 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:44,053 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 05:05:44,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:44,054 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:44,068 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:44,069 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:05:44,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:44,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:44,224 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:44,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:44,322 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:44,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:44,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-11-07 05:05:44,352 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:44,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 05:05:44,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 05:05:44,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2018-11-07 05:05:44,353 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 13 states. [2018-11-07 05:05:44,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:44,957 INFO L93 Difference]: Finished difference Result 79 states and 91 transitions. [2018-11-07 05:05:44,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 05:05:44,959 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 29 [2018-11-07 05:05:44,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:44,961 INFO L225 Difference]: With dead ends: 79 [2018-11-07 05:05:44,961 INFO L226 Difference]: Without dead ends: 62 [2018-11-07 05:05:44,962 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 49 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2018-11-07 05:05:44,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-11-07 05:05:44,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 40. [2018-11-07 05:05:44,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-11-07 05:05:44,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2018-11-07 05:05:44,972 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 29 [2018-11-07 05:05:44,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:44,972 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2018-11-07 05:05:44,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 05:05:44,972 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2018-11-07 05:05:44,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-11-07 05:05:44,974 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:44,974 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:44,974 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:44,974 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:44,975 INFO L82 PathProgramCache]: Analyzing trace with hash -446111159, now seen corresponding path program 2 times [2018-11-07 05:05:44,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:44,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:44,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:44,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:44,976 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:44,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:45,072 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:45,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:45,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:45,073 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:45,074 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:45,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:45,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:45,083 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:05:45,084 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:05:45,107 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 05:05:45,107 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:45,110 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:45,142 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:45,143 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:45,198 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 05:05:45,218 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:45,218 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2018-11-07 05:05:45,218 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:45,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 05:05:45,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 05:05:45,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-11-07 05:05:45,220 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 10 states. [2018-11-07 05:05:45,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:45,355 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2018-11-07 05:05:45,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 05:05:45,357 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-11-07 05:05:45,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:45,359 INFO L225 Difference]: With dead ends: 50 [2018-11-07 05:05:45,359 INFO L226 Difference]: Without dead ends: 48 [2018-11-07 05:05:45,360 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 59 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-11-07 05:05:45,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-07 05:05:45,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-07 05:05:45,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-07 05:05:45,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2018-11-07 05:05:45,368 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 31 [2018-11-07 05:05:45,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:45,369 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2018-11-07 05:05:45,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 05:05:45,369 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2018-11-07 05:05:45,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-07 05:05:45,370 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:45,371 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:45,371 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:45,371 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:45,371 INFO L82 PathProgramCache]: Analyzing trace with hash 94447981, now seen corresponding path program 3 times [2018-11-07 05:05:45,372 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:45,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:45,373 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:45,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:45,373 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:45,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:45,517 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:45,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:45,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:45,518 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:45,518 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:45,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:45,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:45,526 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:05:45,527 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:05:45,542 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:05:45,542 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:45,546 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:45,819 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:45,819 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:45,884 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:45,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:45,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 18 [2018-11-07 05:05:45,906 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:45,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 05:05:45,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 05:05:45,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2018-11-07 05:05:45,908 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 18 states. [2018-11-07 05:05:46,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:46,255 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2018-11-07 05:05:46,255 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 05:05:46,255 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-11-07 05:05:46,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:46,258 INFO L225 Difference]: With dead ends: 87 [2018-11-07 05:05:46,259 INFO L226 Difference]: Without dead ends: 66 [2018-11-07 05:05:46,260 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 64 SyntacticMatches, 8 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=163, Invalid=487, Unknown=0, NotChecked=0, Total=650 [2018-11-07 05:05:46,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-11-07 05:05:46,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 50. [2018-11-07 05:05:46,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-11-07 05:05:46,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-11-07 05:05:46,269 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-11-07 05:05:46,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:46,270 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-11-07 05:05:46,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 05:05:46,270 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-11-07 05:05:46,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-07 05:05:46,271 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:46,271 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:46,271 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:46,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:46,272 INFO L82 PathProgramCache]: Analyzing trace with hash 594202361, now seen corresponding path program 1 times [2018-11-07 05:05:46,272 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:46,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:46,273 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:46,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:46,273 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:46,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:46,542 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:46,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:46,542 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:46,542 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-11-07 05:05:46,543 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [20], [22], [26], [30], [34], [36], [40], [44], [50], [52], [57], [60], [62], [65], [67], [68], [69], [70], [72], [73] [2018-11-07 05:05:46,545 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-07 05:05:46,545 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 05:05:46,943 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 05:05:46,943 INFO L272 AbstractInterpreter]: Visited 25 different actions 368 times. Merged at 12 different actions 164 times. Widened at 5 different actions 32 times. Found 21 fixpoints after 4 different actions. Largest state had 14 variables. [2018-11-07 05:05:46,983 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:46,984 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 05:05:46,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:46,984 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:46,999 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:46,999 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:05:47,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:47,038 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:47,310 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:47,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:47,406 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:47,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:47,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2018-11-07 05:05:47,428 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:47,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 05:05:47,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 05:05:47,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2018-11-07 05:05:47,430 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 17 states. [2018-11-07 05:05:47,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:47,701 INFO L93 Difference]: Finished difference Result 103 states and 118 transitions. [2018-11-07 05:05:47,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 05:05:47,702 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-11-07 05:05:47,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:47,703 INFO L225 Difference]: With dead ends: 103 [2018-11-07 05:05:47,703 INFO L226 Difference]: Without dead ends: 82 [2018-11-07 05:05:47,704 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 65 SyntacticMatches, 8 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=171, Invalid=531, Unknown=0, NotChecked=0, Total=702 [2018-11-07 05:05:47,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-11-07 05:05:47,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 50. [2018-11-07 05:05:47,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-11-07 05:05:47,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-11-07 05:05:47,715 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-11-07 05:05:47,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:47,715 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-11-07 05:05:47,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 05:05:47,716 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-11-07 05:05:47,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-07 05:05:47,717 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:47,717 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:47,717 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:47,717 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:47,718 INFO L82 PathProgramCache]: Analyzing trace with hash -1103599739, now seen corresponding path program 2 times [2018-11-07 05:05:47,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:47,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:47,719 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:47,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:47,719 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:47,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:47,874 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:47,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:47,875 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:47,875 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:47,875 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:47,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:47,875 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:47,883 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:05:47,883 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:05:47,902 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 05:05:47,902 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:47,905 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:48,258 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:48,259 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:48,394 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:48,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:48,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-11-07 05:05:48,416 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:48,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 05:05:48,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 05:05:48,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2018-11-07 05:05:48,417 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 16 states. [2018-11-07 05:05:48,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:48,695 INFO L93 Difference]: Finished difference Result 122 states and 142 transitions. [2018-11-07 05:05:48,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 05:05:48,698 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2018-11-07 05:05:48,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:48,699 INFO L225 Difference]: With dead ends: 122 [2018-11-07 05:05:48,700 INFO L226 Difference]: Without dead ends: 101 [2018-11-07 05:05:48,701 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 66 SyntacticMatches, 8 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=163, Invalid=487, Unknown=0, NotChecked=0, Total=650 [2018-11-07 05:05:48,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2018-11-07 05:05:48,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 53. [2018-11-07 05:05:48,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-11-07 05:05:48,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2018-11-07 05:05:48,712 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 39 [2018-11-07 05:05:48,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:48,713 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2018-11-07 05:05:48,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 05:05:48,713 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2018-11-07 05:05:48,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 05:05:48,714 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:48,715 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:48,715 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:48,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:48,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1990570393, now seen corresponding path program 4 times [2018-11-07 05:05:48,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:48,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:48,716 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:48,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:48,716 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:48,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:48,830 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-07 05:05:48,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:48,831 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:48,831 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:48,831 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:48,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:48,832 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:48,841 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:48,841 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:05:48,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:48,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:48,881 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:48,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:48,943 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-11-07 05:05:48,964 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:48,965 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2018-11-07 05:05:48,965 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:48,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 05:05:48,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 05:05:48,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-11-07 05:05:48,966 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand 11 states. [2018-11-07 05:05:49,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:49,366 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2018-11-07 05:05:49,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 05:05:49,367 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2018-11-07 05:05:49,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:49,369 INFO L225 Difference]: With dead ends: 63 [2018-11-07 05:05:49,369 INFO L226 Difference]: Without dead ends: 61 [2018-11-07 05:05:49,369 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 78 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-11-07 05:05:49,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-07 05:05:49,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-11-07 05:05:49,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-11-07 05:05:49,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2018-11-07 05:05:49,379 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 41 [2018-11-07 05:05:49,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:49,380 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2018-11-07 05:05:49,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 05:05:49,380 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2018-11-07 05:05:49,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-07 05:05:49,381 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:49,381 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:49,382 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:49,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:49,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1735104395, now seen corresponding path program 5 times [2018-11-07 05:05:49,382 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:49,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:49,383 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:49,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:49,383 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:49,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:49,528 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:49,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:49,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:49,529 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:49,529 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:49,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:49,529 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:49,543 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:05:49,543 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:05:49,560 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-07 05:05:49,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:49,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:49,724 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:49,724 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:49,841 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:49,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:49,868 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 22 [2018-11-07 05:05:49,868 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:49,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 05:05:49,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 05:05:49,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2018-11-07 05:05:49,869 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand 22 states. [2018-11-07 05:05:50,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:50,483 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2018-11-07 05:05:50,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 05:05:50,485 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-11-07 05:05:50,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:50,486 INFO L225 Difference]: With dead ends: 110 [2018-11-07 05:05:50,486 INFO L226 Difference]: Without dead ends: 85 [2018-11-07 05:05:50,487 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 80 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=233, Invalid=759, Unknown=0, NotChecked=0, Total=992 [2018-11-07 05:05:50,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-11-07 05:05:50,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 63. [2018-11-07 05:05:50,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-07 05:05:50,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-11-07 05:05:50,511 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 49 [2018-11-07 05:05:50,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:50,511 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-11-07 05:05:50,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 05:05:50,511 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-11-07 05:05:50,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-07 05:05:50,518 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:50,518 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:50,518 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:50,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:50,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1916583447, now seen corresponding path program 2 times [2018-11-07 05:05:50,522 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:50,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:50,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:50,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:50,523 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:50,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:50,713 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:50,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:50,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:50,713 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:50,714 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:50,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:50,714 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:50,722 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:05:50,722 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:05:50,792 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-11-07 05:05:50,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:50,795 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:51,085 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:51,086 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:51,269 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:51,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:51,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 21 [2018-11-07 05:05:51,289 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:51,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 05:05:51,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 05:05:51,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2018-11-07 05:05:51,290 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 21 states. [2018-11-07 05:05:51,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:51,635 INFO L93 Difference]: Finished difference Result 132 states and 151 transitions. [2018-11-07 05:05:51,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 05:05:51,636 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2018-11-07 05:05:51,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:51,638 INFO L225 Difference]: With dead ends: 132 [2018-11-07 05:05:51,638 INFO L226 Difference]: Without dead ends: 107 [2018-11-07 05:05:51,639 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 81 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=253, Invalid=869, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 05:05:51,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-11-07 05:05:51,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 63. [2018-11-07 05:05:51,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-07 05:05:51,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-11-07 05:05:51,653 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 49 [2018-11-07 05:05:51,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:51,653 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-11-07 05:05:51,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 05:05:51,654 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-11-07 05:05:51,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-07 05:05:51,655 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:51,655 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:51,655 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:51,655 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:51,655 INFO L82 PathProgramCache]: Analyzing trace with hash -402778205, now seen corresponding path program 3 times [2018-11-07 05:05:51,655 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:51,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:51,656 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:51,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:51,657 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:51,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:51,831 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:51,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:51,831 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:51,831 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:51,832 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:51,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:51,832 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:51,841 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:05:51,841 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:05:51,854 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:05:51,855 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:51,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:52,082 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:52,082 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:52,147 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:52,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:52,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2018-11-07 05:05:52,170 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:52,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 05:05:52,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 05:05:52,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2018-11-07 05:05:52,171 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 20 states. [2018-11-07 05:05:52,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:52,537 INFO L93 Difference]: Finished difference Result 152 states and 176 transitions. [2018-11-07 05:05:52,546 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 05:05:52,546 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 49 [2018-11-07 05:05:52,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:52,547 INFO L225 Difference]: With dead ends: 152 [2018-11-07 05:05:52,548 INFO L226 Difference]: Without dead ends: 127 [2018-11-07 05:05:52,550 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 82 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=253, Invalid=869, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 05:05:52,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-11-07 05:05:52,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 63. [2018-11-07 05:05:52,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-07 05:05:52,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-11-07 05:05:52,577 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 49 [2018-11-07 05:05:52,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:52,578 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-11-07 05:05:52,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 05:05:52,578 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-11-07 05:05:52,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-11-07 05:05:52,579 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:52,579 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:52,579 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:52,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:52,579 INFO L82 PathProgramCache]: Analyzing trace with hash 488662063, now seen corresponding path program 3 times [2018-11-07 05:05:52,579 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:52,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:52,580 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:52,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:52,581 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:52,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:52,762 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:52,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:52,763 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:52,763 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:52,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:52,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:52,763 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:52,772 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:05:52,772 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:05:52,790 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:05:52,791 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:52,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:52,933 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:52,934 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:53,146 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:53,166 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:53,167 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 19 [2018-11-07 05:05:53,167 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:53,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 05:05:53,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 05:05:53,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2018-11-07 05:05:53,168 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 19 states. [2018-11-07 05:05:54,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:54,037 INFO L93 Difference]: Finished difference Result 175 states and 205 transitions. [2018-11-07 05:05:54,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 05:05:54,037 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2018-11-07 05:05:54,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:54,039 INFO L225 Difference]: With dead ends: 175 [2018-11-07 05:05:54,039 INFO L226 Difference]: Without dead ends: 150 [2018-11-07 05:05:54,040 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 83 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=233, Invalid=759, Unknown=0, NotChecked=0, Total=992 [2018-11-07 05:05:54,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-11-07 05:05:54,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 66. [2018-11-07 05:05:54,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-07 05:05:54,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 72 transitions. [2018-11-07 05:05:54,057 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 72 transitions. Word has length 49 [2018-11-07 05:05:54,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:54,058 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 72 transitions. [2018-11-07 05:05:54,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 05:05:54,058 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 72 transitions. [2018-11-07 05:05:54,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-11-07 05:05:54,059 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:54,059 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:54,059 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:54,060 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:54,060 INFO L82 PathProgramCache]: Analyzing trace with hash -396473339, now seen corresponding path program 6 times [2018-11-07 05:05:54,060 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:54,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:54,061 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:54,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:54,061 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:54,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:54,213 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 05:05:54,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:54,213 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:54,213 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:54,213 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:54,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:54,214 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:54,222 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:05:54,222 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:05:54,252 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:05:54,252 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:54,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:54,311 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:54,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:54,357 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 05:05:54,377 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:54,377 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2018-11-07 05:05:54,377 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:54,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 05:05:54,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 05:05:54,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-11-07 05:05:54,378 INFO L87 Difference]: Start difference. First operand 66 states and 72 transitions. Second operand 12 states. [2018-11-07 05:05:54,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:54,528 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2018-11-07 05:05:54,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 05:05:54,529 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 51 [2018-11-07 05:05:54,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:54,530 INFO L225 Difference]: With dead ends: 76 [2018-11-07 05:05:54,530 INFO L226 Difference]: Without dead ends: 74 [2018-11-07 05:05:54,531 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 9 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-11-07 05:05:54,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-11-07 05:05:54,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2018-11-07 05:05:54,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-11-07 05:05:54,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 80 transitions. [2018-11-07 05:05:54,544 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 80 transitions. Word has length 51 [2018-11-07 05:05:54,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:54,544 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 80 transitions. [2018-11-07 05:05:54,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 05:05:54,545 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 80 transitions. [2018-11-07 05:05:54,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 05:05:54,546 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:54,546 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:54,546 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:54,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:54,546 INFO L82 PathProgramCache]: Analyzing trace with hash 928978729, now seen corresponding path program 7 times [2018-11-07 05:05:54,547 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:54,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:54,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:54,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:54,548 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:54,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:54,749 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:54,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:54,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:54,750 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:54,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:54,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:54,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:54,759 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:54,760 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:05:54,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:54,778 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:54,960 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:54,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:55,038 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:55,058 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:55,058 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2018-11-07 05:05:55,058 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:55,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 05:05:55,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 05:05:55,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2018-11-07 05:05:55,059 INFO L87 Difference]: Start difference. First operand 74 states and 80 transitions. Second operand 26 states. [2018-11-07 05:05:55,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:55,331 INFO L93 Difference]: Finished difference Result 133 states and 150 transitions. [2018-11-07 05:05:55,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 05:05:55,331 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2018-11-07 05:05:55,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:55,332 INFO L225 Difference]: With dead ends: 133 [2018-11-07 05:05:55,332 INFO L226 Difference]: Without dead ends: 104 [2018-11-07 05:05:55,334 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 96 SyntacticMatches, 12 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=315, Invalid=1091, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 05:05:55,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-11-07 05:05:55,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 76. [2018-11-07 05:05:55,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-11-07 05:05:55,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-11-07 05:05:55,347 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-11-07 05:05:55,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:55,347 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-11-07 05:05:55,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 05:05:55,347 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-11-07 05:05:55,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 05:05:55,348 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:55,348 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:55,348 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:55,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:55,348 INFO L82 PathProgramCache]: Analyzing trace with hash 277511861, now seen corresponding path program 4 times [2018-11-07 05:05:55,348 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:55,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:55,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:55,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:55,349 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:55,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:55,487 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:55,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:55,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:55,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:55,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:55,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:55,487 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:55,497 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:55,497 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:05:55,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:55,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:55,684 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:55,684 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:55,761 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:55,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:55,781 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 25 [2018-11-07 05:05:55,781 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:55,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 05:05:55,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 05:05:55,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=474, Unknown=0, NotChecked=0, Total=600 [2018-11-07 05:05:55,782 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 25 states. [2018-11-07 05:05:56,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:56,520 INFO L93 Difference]: Finished difference Result 161 states and 184 transitions. [2018-11-07 05:05:56,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 05:05:56,521 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 59 [2018-11-07 05:05:56,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:56,522 INFO L225 Difference]: With dead ends: 161 [2018-11-07 05:05:56,522 INFO L226 Difference]: Without dead ends: 132 [2018-11-07 05:05:56,523 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 97 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 570 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=1289, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 05:05:56,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-11-07 05:05:56,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 76. [2018-11-07 05:05:56,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-11-07 05:05:56,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-11-07 05:05:56,538 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-11-07 05:05:56,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:56,538 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-11-07 05:05:56,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 05:05:56,539 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-11-07 05:05:56,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 05:05:56,539 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:56,539 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:56,539 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:56,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:56,539 INFO L82 PathProgramCache]: Analyzing trace with hash -129869503, now seen corresponding path program 5 times [2018-11-07 05:05:56,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:56,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:56,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:56,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:56,541 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:56,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:56,763 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:56,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:56,764 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:56,764 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:56,764 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:56,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:56,764 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:56,773 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:05:56,773 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:05:56,791 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 05:05:56,791 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:56,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:57,206 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:57,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:57,312 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 44 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:57,331 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:57,332 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 24 [2018-11-07 05:05:57,332 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:57,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 05:05:57,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 05:05:57,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2018-11-07 05:05:57,333 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 24 states. [2018-11-07 05:05:57,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:57,771 INFO L93 Difference]: Finished difference Result 187 states and 216 transitions. [2018-11-07 05:05:57,771 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 05:05:57,771 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-11-07 05:05:57,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:57,772 INFO L225 Difference]: With dead ends: 187 [2018-11-07 05:05:57,772 INFO L226 Difference]: Without dead ends: 158 [2018-11-07 05:05:57,773 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 98 SyntacticMatches, 12 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 573 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=364, Invalid=1358, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 05:05:57,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2018-11-07 05:05:57,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 76. [2018-11-07 05:05:57,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-11-07 05:05:57,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-11-07 05:05:57,793 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-11-07 05:05:57,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:57,793 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-11-07 05:05:57,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 05:05:57,794 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-11-07 05:05:57,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 05:05:57,794 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:57,795 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:57,795 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:57,795 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:57,795 INFO L82 PathProgramCache]: Analyzing trace with hash -49846579, now seen corresponding path program 6 times [2018-11-07 05:05:57,795 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:57,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:57,796 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:57,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:57,796 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:57,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:57,933 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:57,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:57,933 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:57,933 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:57,933 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:57,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:57,933 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:57,943 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:05:57,943 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:05:57,982 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:05:57,982 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:05:57,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:58,134 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:58,134 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:05:58,223 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 44 proven. 14 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:58,243 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:05:58,243 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2018-11-07 05:05:58,243 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:05:58,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 05:05:58,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 05:05:58,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2018-11-07 05:05:58,244 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2018-11-07 05:05:58,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:05:58,720 INFO L93 Difference]: Finished difference Result 211 states and 246 transitions. [2018-11-07 05:05:58,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 05:05:58,721 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 59 [2018-11-07 05:05:58,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:05:58,722 INFO L225 Difference]: With dead ends: 211 [2018-11-07 05:05:58,722 INFO L226 Difference]: Without dead ends: 182 [2018-11-07 05:05:58,723 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 99 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=1289, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 05:05:58,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-11-07 05:05:58,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 76. [2018-11-07 05:05:58,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-11-07 05:05:58,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2018-11-07 05:05:58,747 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 59 [2018-11-07 05:05:58,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:05:58,747 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2018-11-07 05:05:58,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 05:05:58,747 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2018-11-07 05:05:58,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 05:05:58,748 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:05:58,748 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:05:58,749 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:05:58,749 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:05:58,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1451911001, now seen corresponding path program 4 times [2018-11-07 05:05:58,749 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:05:58,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:58,750 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:05:58,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:05:58,750 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:05:58,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:59,736 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:59,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:59,737 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:05:59,737 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:05:59,737 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:05:59,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:05:59,737 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:05:59,747 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:05:59,747 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:05:59,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:05:59,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:05:59,918 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:05:59,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:00,015 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:06:00,035 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:00,035 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-11-07 05:06:00,035 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:00,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 05:06:00,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 05:06:00,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2018-11-07 05:06:00,037 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 22 states. [2018-11-07 05:06:00,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:00,454 INFO L93 Difference]: Finished difference Result 238 states and 280 transitions. [2018-11-07 05:06:00,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 05:06:00,454 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 59 [2018-11-07 05:06:00,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:00,456 INFO L225 Difference]: With dead ends: 238 [2018-11-07 05:06:00,456 INFO L226 Difference]: Without dead ends: 209 [2018-11-07 05:06:00,457 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 100 SyntacticMatches, 12 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=315, Invalid=1091, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 05:06:00,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-11-07 05:06:00,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 79. [2018-11-07 05:06:00,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 05:06:00,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 86 transitions. [2018-11-07 05:06:00,481 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 86 transitions. Word has length 59 [2018-11-07 05:06:00,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:00,482 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 86 transitions. [2018-11-07 05:06:00,482 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 05:06:00,482 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 86 transitions. [2018-11-07 05:06:00,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-11-07 05:06:00,483 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:00,483 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:00,483 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:00,483 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:00,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1954413347, now seen corresponding path program 8 times [2018-11-07 05:06:00,483 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:00,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:00,484 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:00,484 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:00,484 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:00,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:00,657 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 05:06:00,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:00,657 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:00,657 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:00,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:00,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:00,658 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:00,666 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:00,666 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:00,685 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 05:06:00,686 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:00,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:00,710 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:06:00,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:00,782 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 05:06:00,801 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:00,802 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2018-11-07 05:06:00,802 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:00,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 05:06:00,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 05:06:00,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-11-07 05:06:00,802 INFO L87 Difference]: Start difference. First operand 79 states and 86 transitions. Second operand 13 states. [2018-11-07 05:06:00,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:00,930 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2018-11-07 05:06:00,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 05:06:00,931 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2018-11-07 05:06:00,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:00,931 INFO L225 Difference]: With dead ends: 89 [2018-11-07 05:06:00,931 INFO L226 Difference]: Without dead ends: 87 [2018-11-07 05:06:00,932 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-11-07 05:06:00,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-11-07 05:06:00,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-11-07 05:06:00,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-11-07 05:06:00,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 94 transitions. [2018-11-07 05:06:00,949 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 94 transitions. Word has length 61 [2018-11-07 05:06:00,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:00,950 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 94 transitions. [2018-11-07 05:06:00,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 05:06:00,950 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 94 transitions. [2018-11-07 05:06:00,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 05:06:00,951 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:00,951 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:00,951 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:00,951 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:00,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1550108743, now seen corresponding path program 9 times [2018-11-07 05:06:00,951 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:00,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:00,952 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:00,952 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:00,952 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:00,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:01,719 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:01,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:01,719 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:01,719 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:01,719 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:01,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:01,719 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:01,729 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:01,729 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:01,756 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:01,756 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:01,758 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:02,203 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:02,203 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:02,373 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:02,392 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:02,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 30 [2018-11-07 05:06:02,393 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:02,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 05:06:02,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 05:06:02,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=685, Unknown=0, NotChecked=0, Total=870 [2018-11-07 05:06:02,394 INFO L87 Difference]: Start difference. First operand 87 states and 94 transitions. Second operand 30 states. [2018-11-07 05:06:02,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:02,817 INFO L93 Difference]: Finished difference Result 156 states and 176 transitions. [2018-11-07 05:06:02,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 05:06:02,818 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 69 [2018-11-07 05:06:02,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:02,820 INFO L225 Difference]: With dead ends: 156 [2018-11-07 05:06:02,820 INFO L226 Difference]: Without dead ends: 123 [2018-11-07 05:06:02,821 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 112 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=409, Invalid=1483, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 05:06:02,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-11-07 05:06:02,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 89. [2018-11-07 05:06:02,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 05:06:02,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-11-07 05:06:02,843 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-11-07 05:06:02,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:02,843 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-11-07 05:06:02,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 05:06:02,843 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-11-07 05:06:02,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 05:06:02,844 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:02,844 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:02,844 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:02,844 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:02,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1825386707, now seen corresponding path program 7 times [2018-11-07 05:06:02,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:02,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:02,845 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:02,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:02,846 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:02,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:03,052 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:03,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:03,052 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:03,052 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:03,052 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:03,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:03,052 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:03,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:03,061 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:03,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:03,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:03,320 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:03,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:03,606 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:03,625 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:03,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 29 [2018-11-07 05:06:03,626 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:03,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 05:06:03,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 05:06:03,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2018-11-07 05:06:03,627 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 29 states. [2018-11-07 05:06:04,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:04,125 INFO L93 Difference]: Finished difference Result 190 states and 217 transitions. [2018-11-07 05:06:04,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 05:06:04,125 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 69 [2018-11-07 05:06:04,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:04,126 INFO L225 Difference]: With dead ends: 190 [2018-11-07 05:06:04,127 INFO L226 Difference]: Without dead ends: 157 [2018-11-07 05:06:04,128 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 113 SyntacticMatches, 14 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 837 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=465, Invalid=1791, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 05:06:04,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-11-07 05:06:04,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 89. [2018-11-07 05:06:04,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 05:06:04,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-11-07 05:06:04,158 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-11-07 05:06:04,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:04,158 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-11-07 05:06:04,159 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 05:06:04,160 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-11-07 05:06:04,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 05:06:04,160 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:04,160 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:04,161 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:04,161 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:04,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1995551649, now seen corresponding path program 8 times [2018-11-07 05:06:04,161 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:04,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:04,162 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:04,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:04,162 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:04,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:04,322 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:04,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:04,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:04,323 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:04,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:04,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:04,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:04,331 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:04,331 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:04,354 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 05:06:04,354 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:04,357 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:04,568 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:04,568 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:04,758 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:04,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:04,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 28 [2018-11-07 05:06:04,778 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:04,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 05:06:04,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 05:06:04,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=603, Unknown=0, NotChecked=0, Total=756 [2018-11-07 05:06:04,779 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 28 states. [2018-11-07 05:06:05,118 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-11-07 05:06:05,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:05,585 INFO L93 Difference]: Finished difference Result 222 states and 256 transitions. [2018-11-07 05:06:05,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 05:06:05,585 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 69 [2018-11-07 05:06:05,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:05,586 INFO L225 Difference]: With dead ends: 222 [2018-11-07 05:06:05,586 INFO L226 Difference]: Without dead ends: 189 [2018-11-07 05:06:05,587 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 114 SyntacticMatches, 14 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=496, Invalid=1954, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 05:06:05,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-11-07 05:06:05,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 89. [2018-11-07 05:06:05,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 05:06:05,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-11-07 05:06:05,613 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-11-07 05:06:05,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:05,614 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-11-07 05:06:05,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 05:06:05,614 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-11-07 05:06:05,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 05:06:05,614 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:05,615 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:05,615 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:05,615 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:05,615 INFO L82 PathProgramCache]: Analyzing trace with hash 632871659, now seen corresponding path program 9 times [2018-11-07 05:06:05,615 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:05,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:05,616 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:05,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:05,616 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:05,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:05,788 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:05,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:05,788 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:05,788 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:05,789 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:05,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:05,789 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:05,813 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:05,814 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:05,831 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:05,831 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:05,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:06,049 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:06,049 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:06,136 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 65 proven. 18 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:06,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:06,156 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 27 [2018-11-07 05:06:06,156 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:06,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 05:06:06,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 05:06:06,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=559, Unknown=0, NotChecked=0, Total=702 [2018-11-07 05:06:06,157 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 27 states. [2018-11-07 05:06:07,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:07,113 INFO L93 Difference]: Finished difference Result 252 states and 293 transitions. [2018-11-07 05:06:07,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 05:06:07,114 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2018-11-07 05:06:07,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:07,115 INFO L225 Difference]: With dead ends: 252 [2018-11-07 05:06:07,115 INFO L226 Difference]: Without dead ends: 219 [2018-11-07 05:06:07,116 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 115 SyntacticMatches, 14 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 849 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=496, Invalid=1954, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 05:06:07,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-11-07 05:06:07,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 89. [2018-11-07 05:06:07,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 05:06:07,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-11-07 05:06:07,150 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-11-07 05:06:07,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:07,150 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-11-07 05:06:07,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 05:06:07,151 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-11-07 05:06:07,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 05:06:07,151 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:07,151 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:07,152 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:07,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:07,152 INFO L82 PathProgramCache]: Analyzing trace with hash 613260407, now seen corresponding path program 10 times [2018-11-07 05:06:07,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:07,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:07,153 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:07,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:07,153 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:07,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:07,529 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:07,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:07,529 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:07,529 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:07,530 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:07,530 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:07,530 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:07,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:07,537 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:07,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:07,558 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:07,745 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:07,746 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:07,872 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 65 proven. 22 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:07,892 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:07,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2018-11-07 05:06:07,893 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:07,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 05:06:07,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 05:06:07,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=513, Unknown=0, NotChecked=0, Total=650 [2018-11-07 05:06:07,894 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 26 states. [2018-11-07 05:06:08,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:08,441 INFO L93 Difference]: Finished difference Result 280 states and 328 transitions. [2018-11-07 05:06:08,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 05:06:08,441 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 69 [2018-11-07 05:06:08,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:08,443 INFO L225 Difference]: With dead ends: 280 [2018-11-07 05:06:08,443 INFO L226 Difference]: Without dead ends: 247 [2018-11-07 05:06:08,444 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 116 SyntacticMatches, 14 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 759 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=465, Invalid=1791, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 05:06:08,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-11-07 05:06:08,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 89. [2018-11-07 05:06:08,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 05:06:08,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2018-11-07 05:06:08,476 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 69 [2018-11-07 05:06:08,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:08,477 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2018-11-07 05:06:08,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 05:06:08,477 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2018-11-07 05:06:08,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 05:06:08,478 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:08,478 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:08,478 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:08,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:08,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1618825475, now seen corresponding path program 5 times [2018-11-07 05:06:08,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:08,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:08,479 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:08,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:08,479 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:08,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:08,675 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:08,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:08,675 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:08,675 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:08,676 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:08,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:08,676 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:08,685 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:08,686 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:08,710 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 05:06:08,710 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:08,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:08,904 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:08,904 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:09,000 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:09,019 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:09,019 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-11-07 05:06:09,019 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:09,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 05:06:09,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 05:06:09,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=465, Unknown=0, NotChecked=0, Total=600 [2018-11-07 05:06:09,021 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 25 states. [2018-11-07 05:06:09,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:09,702 INFO L93 Difference]: Finished difference Result 311 states and 367 transitions. [2018-11-07 05:06:09,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 05:06:09,702 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-11-07 05:06:09,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:09,704 INFO L225 Difference]: With dead ends: 311 [2018-11-07 05:06:09,704 INFO L226 Difference]: Without dead ends: 278 [2018-11-07 05:06:09,705 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 117 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 605 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=409, Invalid=1483, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 05:06:09,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2018-11-07 05:06:09,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 92. [2018-11-07 05:06:09,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-11-07 05:06:09,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 100 transitions. [2018-11-07 05:06:09,754 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 100 transitions. Word has length 69 [2018-11-07 05:06:09,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:09,755 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 100 transitions. [2018-11-07 05:06:09,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 05:06:09,755 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 100 transitions. [2018-11-07 05:06:09,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-11-07 05:06:09,756 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:09,756 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:09,756 INFO L423 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:09,756 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:09,756 INFO L82 PathProgramCache]: Analyzing trace with hash 2111470529, now seen corresponding path program 10 times [2018-11-07 05:06:09,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:09,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:09,757 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:09,757 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:09,757 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:09,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:10,955 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-07 05:06:10,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:10,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:10,955 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:10,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:10,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:10,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:10,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:10,963 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:10,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:10,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:11,403 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:11,403 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:12,539 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 05:06:12,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:12,558 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2018-11-07 05:06:12,558 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:12,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 05:06:12,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 05:06:12,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-11-07 05:06:12,559 INFO L87 Difference]: Start difference. First operand 92 states and 100 transitions. Second operand 14 states. [2018-11-07 05:06:12,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:12,736 INFO L93 Difference]: Finished difference Result 102 states and 110 transitions. [2018-11-07 05:06:12,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 05:06:12,737 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 71 [2018-11-07 05:06:12,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:12,738 INFO L225 Difference]: With dead ends: 102 [2018-11-07 05:06:12,738 INFO L226 Difference]: Without dead ends: 100 [2018-11-07 05:06:12,739 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 135 SyntacticMatches, 13 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-11-07 05:06:12,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-11-07 05:06:12,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-11-07 05:06:12,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-11-07 05:06:12,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 108 transitions. [2018-11-07 05:06:12,769 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 108 transitions. Word has length 71 [2018-11-07 05:06:12,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:12,769 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 108 transitions. [2018-11-07 05:06:12,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 05:06:12,770 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 108 transitions. [2018-11-07 05:06:12,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-07 05:06:12,770 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:12,770 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:12,770 INFO L423 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:12,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:12,771 INFO L82 PathProgramCache]: Analyzing trace with hash 58575589, now seen corresponding path program 11 times [2018-11-07 05:06:12,771 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:12,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:12,771 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:12,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:12,772 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:12,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:12,954 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:12,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:12,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:12,955 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:12,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:12,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:12,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 05:06:12,963 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:12,963 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:12,990 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-07 05:06:12,990 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:12,992 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:13,282 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:13,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:13,421 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:13,440 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:13,440 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 34 [2018-11-07 05:06:13,440 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:13,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 05:06:13,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 05:06:13,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=887, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 05:06:13,442 INFO L87 Difference]: Start difference. First operand 100 states and 108 transitions. Second operand 34 states. [2018-11-07 05:06:14,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:14,194 INFO L93 Difference]: Finished difference Result 179 states and 202 transitions. [2018-11-07 05:06:14,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 05:06:14,194 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 79 [2018-11-07 05:06:14,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:14,195 INFO L225 Difference]: With dead ends: 179 [2018-11-07 05:06:14,195 INFO L226 Difference]: Without dead ends: 142 [2018-11-07 05:06:14,196 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 128 SyntacticMatches, 16 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1025 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=515, Invalid=1935, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 05:06:14,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-11-07 05:06:14,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 102. [2018-11-07 05:06:14,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-07 05:06:14,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-11-07 05:06:14,238 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-11-07 05:06:14,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:14,239 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-11-07 05:06:14,239 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 05:06:14,239 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-11-07 05:06:14,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-07 05:06:14,239 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:14,240 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:14,240 INFO L423 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:14,240 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:14,240 INFO L82 PathProgramCache]: Analyzing trace with hash 127267953, now seen corresponding path program 11 times [2018-11-07 05:06:14,240 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:14,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:14,241 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:14,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:14,241 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:14,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:14,477 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:14,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:14,478 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:14,478 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:14,478 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:14,478 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:14,478 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 05:06:14,488 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:14,489 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:14,515 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-07 05:06:14,515 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:14,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:14,764 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:14,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:14,882 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:14,901 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:14,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 33 [2018-11-07 05:06:14,902 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:14,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 05:06:14,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 05:06:14,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=842, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 05:06:14,903 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 33 states. [2018-11-07 05:06:15,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:15,711 INFO L93 Difference]: Finished difference Result 219 states and 250 transitions. [2018-11-07 05:06:15,712 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 05:06:15,712 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 79 [2018-11-07 05:06:15,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:15,713 INFO L225 Difference]: With dead ends: 219 [2018-11-07 05:06:15,713 INFO L226 Difference]: Without dead ends: 182 [2018-11-07 05:06:15,714 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 129 SyntacticMatches, 16 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1155 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=595, Invalid=2375, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 05:06:15,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-11-07 05:06:15,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 102. [2018-11-07 05:06:15,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-07 05:06:15,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-11-07 05:06:15,769 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-11-07 05:06:15,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:15,769 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-11-07 05:06:15,769 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 05:06:15,769 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-11-07 05:06:15,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-07 05:06:15,770 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:15,770 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:15,770 INFO L423 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:15,771 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:15,771 INFO L82 PathProgramCache]: Analyzing trace with hash 310579453, now seen corresponding path program 12 times [2018-11-07 05:06:15,771 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:15,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:15,772 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:15,772 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:15,772 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:15,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:16,266 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:16,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:16,266 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:16,266 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:16,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:16,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:16,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 05:06:16,275 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:16,276 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:16,294 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:16,295 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:16,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:16,592 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:16,592 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:16,846 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:16,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:16,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2018-11-07 05:06:16,867 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:16,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 05:06:16,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 05:06:16,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=795, Unknown=0, NotChecked=0, Total=992 [2018-11-07 05:06:16,868 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 32 states. [2018-11-07 05:06:17,586 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-11-07 05:06:17,970 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-11-07 05:06:19,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:19,070 INFO L93 Difference]: Finished difference Result 257 states and 296 transitions. [2018-11-07 05:06:19,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 05:06:19,071 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 79 [2018-11-07 05:06:19,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:19,072 INFO L225 Difference]: With dead ends: 257 [2018-11-07 05:06:19,072 INFO L226 Difference]: Without dead ends: 220 [2018-11-07 05:06:19,074 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 130 SyntacticMatches, 16 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1236 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=649, Invalid=2657, Unknown=0, NotChecked=0, Total=3306 [2018-11-07 05:06:19,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-11-07 05:06:19,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 102. [2018-11-07 05:06:19,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-07 05:06:19,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-11-07 05:06:19,117 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-11-07 05:06:19,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:19,117 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-11-07 05:06:19,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 05:06:19,117 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-11-07 05:06:19,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-07 05:06:19,118 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:19,118 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:19,118 INFO L423 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:19,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:19,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1427775351, now seen corresponding path program 13 times [2018-11-07 05:06:19,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:19,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:19,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:19,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:19,120 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:19,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:19,586 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:19,586 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:19,586 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:19,587 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:19,587 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:19,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:19,587 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 05:06:19,595 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:19,596 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:19,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:19,630 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:19,886 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:19,886 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:19,998 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 90 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:20,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:20,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 31 [2018-11-07 05:06:20,017 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:20,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 05:06:20,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 05:06:20,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=746, Unknown=0, NotChecked=0, Total=930 [2018-11-07 05:06:20,019 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 31 states. [2018-11-07 05:06:20,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:20,778 INFO L93 Difference]: Finished difference Result 293 states and 340 transitions. [2018-11-07 05:06:20,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 05:06:20,778 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 79 [2018-11-07 05:06:20,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:20,780 INFO L225 Difference]: With dead ends: 293 [2018-11-07 05:06:20,780 INFO L226 Difference]: Without dead ends: 256 [2018-11-07 05:06:20,782 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 131 SyntacticMatches, 16 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1248 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=668, Invalid=2754, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 05:06:20,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2018-11-07 05:06:20,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 102. [2018-11-07 05:06:20,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-07 05:06:20,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-11-07 05:06:20,864 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-11-07 05:06:20,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:20,864 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-11-07 05:06:20,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 05:06:20,865 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-11-07 05:06:20,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-07 05:06:20,865 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:20,865 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:20,866 INFO L423 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:20,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:20,866 INFO L82 PathProgramCache]: Analyzing trace with hash 143598357, now seen corresponding path program 14 times [2018-11-07 05:06:20,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:20,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:20,867 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:20,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:20,867 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:20,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:21,055 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:21,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:21,055 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:21,055 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:21,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:21,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:21,055 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 05:06:21,064 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:21,064 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:21,089 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-07 05:06:21,089 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:21,091 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:21,297 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:21,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:21,422 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 90 proven. 26 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:21,442 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:21,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 30 [2018-11-07 05:06:21,442 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:21,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 05:06:21,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 05:06:21,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2018-11-07 05:06:21,443 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 30 states. [2018-11-07 05:06:22,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:22,195 INFO L93 Difference]: Finished difference Result 327 states and 382 transitions. [2018-11-07 05:06:22,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 05:06:22,195 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 79 [2018-11-07 05:06:22,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:22,197 INFO L225 Difference]: With dead ends: 327 [2018-11-07 05:06:22,197 INFO L226 Difference]: Without dead ends: 290 [2018-11-07 05:06:22,198 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 132 SyntacticMatches, 16 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1182 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=649, Invalid=2657, Unknown=0, NotChecked=0, Total=3306 [2018-11-07 05:06:22,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2018-11-07 05:06:22,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 102. [2018-11-07 05:06:22,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-07 05:06:22,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-11-07 05:06:22,244 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-11-07 05:06:22,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:22,245 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-11-07 05:06:22,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 05:06:22,245 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-11-07 05:06:22,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-07 05:06:22,245 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:22,245 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:22,246 INFO L423 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:22,246 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:22,246 INFO L82 PathProgramCache]: Analyzing trace with hash -1602250591, now seen corresponding path program 15 times [2018-11-07 05:06:22,246 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:22,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:22,247 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:22,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:22,247 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:22,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:22,705 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:22,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:22,706 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:22,706 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:22,706 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:22,706 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:22,706 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 05:06:22,714 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:22,714 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:22,737 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:22,737 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:22,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:23,030 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:23,030 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:23,198 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 90 proven. 32 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:23,217 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:23,218 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2018-11-07 05:06:23,218 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:23,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 05:06:23,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 05:06:23,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=642, Unknown=0, NotChecked=0, Total=812 [2018-11-07 05:06:23,219 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 29 states. [2018-11-07 05:06:24,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:24,052 INFO L93 Difference]: Finished difference Result 359 states and 422 transitions. [2018-11-07 05:06:24,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 05:06:24,052 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 79 [2018-11-07 05:06:24,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:24,054 INFO L225 Difference]: With dead ends: 359 [2018-11-07 05:06:24,054 INFO L226 Difference]: Without dead ends: 322 [2018-11-07 05:06:24,055 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 133 SyntacticMatches, 16 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1035 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=595, Invalid=2375, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 05:06:24,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2018-11-07 05:06:24,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 102. [2018-11-07 05:06:24,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-07 05:06:24,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 110 transitions. [2018-11-07 05:06:24,114 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 110 transitions. Word has length 79 [2018-11-07 05:06:24,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:24,114 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 110 transitions. [2018-11-07 05:06:24,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 05:06:24,114 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 110 transitions. [2018-11-07 05:06:24,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-11-07 05:06:24,115 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:24,115 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:24,115 INFO L423 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:24,115 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:24,115 INFO L82 PathProgramCache]: Analyzing trace with hash -1326972627, now seen corresponding path program 6 times [2018-11-07 05:06:24,116 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:24,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:24,116 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:24,116 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:24,116 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:24,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:24,310 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:24,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:24,311 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:24,311 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:24,311 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:24,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:24,311 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 05:06:24,319 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:24,319 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:24,341 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:24,341 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:24,343 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:24,528 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:24,529 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:24,650 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:24,669 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:24,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-11-07 05:06:24,670 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:24,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 05:06:24,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 05:06:24,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=587, Unknown=0, NotChecked=0, Total=756 [2018-11-07 05:06:24,671 INFO L87 Difference]: Start difference. First operand 102 states and 110 transitions. Second operand 28 states. [2018-11-07 05:06:25,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:25,482 INFO L93 Difference]: Finished difference Result 394 states and 466 transitions. [2018-11-07 05:06:25,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 05:06:25,482 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 79 [2018-11-07 05:06:25,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:25,484 INFO L225 Difference]: With dead ends: 394 [2018-11-07 05:06:25,484 INFO L226 Difference]: Without dead ends: 357 [2018-11-07 05:06:25,485 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 134 SyntacticMatches, 16 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=515, Invalid=1935, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 05:06:25,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2018-11-07 05:06:25,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 105. [2018-11-07 05:06:25,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-11-07 05:06:25,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 114 transitions. [2018-11-07 05:06:25,538 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 114 transitions. Word has length 79 [2018-11-07 05:06:25,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:25,538 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 114 transitions. [2018-11-07 05:06:25,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 05:06:25,538 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 114 transitions. [2018-11-07 05:06:25,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-11-07 05:06:25,539 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:25,539 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:25,539 INFO L423 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:25,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:25,539 INFO L82 PathProgramCache]: Analyzing trace with hash 1957490143, now seen corresponding path program 12 times [2018-11-07 05:06:25,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:25,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:25,540 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:25,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:25,540 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:25,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:25,971 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 05:06:25,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:25,972 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:25,972 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:25,972 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:25,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:25,972 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-11-07 05:06:25,981 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:25,982 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:26,009 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:26,009 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:26,011 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:26,089 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:26,089 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:26,272 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 05:06:26,291 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:26,292 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2018-11-07 05:06:26,292 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:26,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 05:06:26,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 05:06:26,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-11-07 05:06:26,292 INFO L87 Difference]: Start difference. First operand 105 states and 114 transitions. Second operand 15 states. [2018-11-07 05:06:26,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:26,549 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2018-11-07 05:06:26,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 05:06:26,550 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 81 [2018-11-07 05:06:26,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:26,551 INFO L225 Difference]: With dead ends: 115 [2018-11-07 05:06:26,551 INFO L226 Difference]: Without dead ends: 113 [2018-11-07 05:06:26,552 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 154 SyntacticMatches, 15 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-11-07 05:06:26,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-11-07 05:06:26,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2018-11-07 05:06:26,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-11-07 05:06:26,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 122 transitions. [2018-11-07 05:06:26,606 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 122 transitions. Word has length 81 [2018-11-07 05:06:26,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:26,606 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 122 transitions. [2018-11-07 05:06:26,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 05:06:26,606 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 122 transitions. [2018-11-07 05:06:26,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 05:06:26,607 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:26,607 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:26,607 INFO L423 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:26,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:26,608 INFO L82 PathProgramCache]: Analyzing trace with hash -507298045, now seen corresponding path program 13 times [2018-11-07 05:06:26,608 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:26,608 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:26,609 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:26,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:26,609 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:26,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:26,878 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:26,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:26,879 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:26,879 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:26,879 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:26,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:26,879 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:26,887 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:26,887 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:26,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:26,913 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:27,230 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:27,230 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:27,395 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:27,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:27,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 38 [2018-11-07 05:06:27,415 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:27,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-11-07 05:06:27,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-11-07 05:06:27,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=1115, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 05:06:27,416 INFO L87 Difference]: Start difference. First operand 113 states and 122 transitions. Second operand 38 states. [2018-11-07 05:06:28,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:28,188 INFO L93 Difference]: Finished difference Result 202 states and 228 transitions. [2018-11-07 05:06:28,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-11-07 05:06:28,189 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 89 [2018-11-07 05:06:28,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:28,190 INFO L225 Difference]: With dead ends: 202 [2018-11-07 05:06:28,190 INFO L226 Difference]: Without dead ends: 161 [2018-11-07 05:06:28,191 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 144 SyntacticMatches, 18 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1336 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=633, Invalid=2447, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 05:06:28,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2018-11-07 05:06:28,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 115. [2018-11-07 05:06:28,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 05:06:28,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-11-07 05:06:28,274 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-11-07 05:06:28,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:28,274 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-11-07 05:06:28,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-11-07 05:06:28,275 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-11-07 05:06:28,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 05:06:28,275 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:28,275 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:28,276 INFO L423 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:28,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:28,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1248990833, now seen corresponding path program 16 times [2018-11-07 05:06:28,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:28,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:28,278 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:28,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:28,279 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:28,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:28,789 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:28,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:28,789 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:28,789 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:28,789 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:28,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:28,789 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:28,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:28,797 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:28,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:28,823 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:29,140 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:29,140 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:29,273 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:29,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:29,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 37 [2018-11-07 05:06:29,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:29,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 05:06:29,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 05:06:29,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 05:06:29,294 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 37 states. [2018-11-07 05:06:30,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:30,121 INFO L93 Difference]: Finished difference Result 248 states and 283 transitions. [2018-11-07 05:06:30,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 05:06:30,122 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 89 [2018-11-07 05:06:30,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:30,123 INFO L225 Difference]: With dead ends: 248 [2018-11-07 05:06:30,123 INFO L226 Difference]: Without dead ends: 207 [2018-11-07 05:06:30,124 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 145 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=741, Invalid=3041, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 05:06:30,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-11-07 05:06:30,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 115. [2018-11-07 05:06:30,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 05:06:30,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-11-07 05:06:30,212 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-11-07 05:06:30,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:30,212 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-11-07 05:06:30,212 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 05:06:30,212 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-11-07 05:06:30,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 05:06:30,213 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:30,213 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:30,213 INFO L423 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:30,214 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:30,214 INFO L82 PathProgramCache]: Analyzing trace with hash 752469787, now seen corresponding path program 17 times [2018-11-07 05:06:30,214 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:30,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:30,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:30,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:30,215 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:30,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:31,141 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:31,141 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:31,141 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:31,142 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:31,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:31,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:31,142 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:31,150 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:31,150 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:31,275 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-07 05:06:31,275 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:31,278 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:31,708 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:31,709 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:31,846 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:31,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:31,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2018-11-07 05:06:31,867 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:31,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 05:06:31,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 05:06:31,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=1013, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 05:06:31,868 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 36 states. [2018-11-07 05:06:32,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:32,938 INFO L93 Difference]: Finished difference Result 292 states and 336 transitions. [2018-11-07 05:06:32,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 05:06:32,938 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 89 [2018-11-07 05:06:32,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:32,940 INFO L225 Difference]: With dead ends: 292 [2018-11-07 05:06:32,940 INFO L226 Difference]: Without dead ends: 251 [2018-11-07 05:06:32,941 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 146 SyntacticMatches, 18 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1662 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=823, Invalid=3467, Unknown=0, NotChecked=0, Total=4290 [2018-11-07 05:06:32,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2018-11-07 05:06:33,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 115. [2018-11-07 05:06:33,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 05:06:33,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-11-07 05:06:33,027 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-11-07 05:06:33,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:33,027 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-11-07 05:06:33,027 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 05:06:33,027 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-11-07 05:06:33,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 05:06:33,027 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:33,028 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:33,028 INFO L423 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:33,028 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:33,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1940416601, now seen corresponding path program 18 times [2018-11-07 05:06:33,028 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:33,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:33,029 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:33,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:33,029 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:33,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:33,378 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:33,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:33,379 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:33,379 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:33,379 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:33,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:33,379 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:33,387 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:33,387 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:33,414 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:33,414 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:33,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:33,744 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:33,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:33,877 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:33,896 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:33,896 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 35 [2018-11-07 05:06:33,896 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:33,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 05:06:33,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 05:06:33,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=959, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 05:06:33,898 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 35 states. [2018-11-07 05:06:35,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:35,040 INFO L93 Difference]: Finished difference Result 334 states and 387 transitions. [2018-11-07 05:06:35,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 05:06:35,040 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 89 [2018-11-07 05:06:35,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:35,042 INFO L225 Difference]: With dead ends: 334 [2018-11-07 05:06:35,042 INFO L226 Difference]: Without dead ends: 293 [2018-11-07 05:06:35,043 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 147 SyntacticMatches, 18 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1724 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=867, Invalid=3689, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 05:06:35,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2018-11-07 05:06:35,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 115. [2018-11-07 05:06:35,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 05:06:35,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-11-07 05:06:35,106 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-11-07 05:06:35,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:35,106 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-11-07 05:06:35,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 05:06:35,106 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-11-07 05:06:35,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 05:06:35,107 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:35,107 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:35,107 INFO L423 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:35,107 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:35,107 INFO L82 PathProgramCache]: Analyzing trace with hash 233315123, now seen corresponding path program 19 times [2018-11-07 05:06:35,107 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:35,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:35,108 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:35,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:35,108 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:35,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:35,502 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:35,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:35,503 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:35,503 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:35,503 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:35,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:35,503 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:35,512 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:35,512 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:35,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:35,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:35,782 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:35,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:36,076 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 119 proven. 32 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:36,095 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:36,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 34 [2018-11-07 05:06:36,096 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:36,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 05:06:36,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 05:06:36,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=903, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 05:06:36,097 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 34 states. [2018-11-07 05:06:37,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:37,202 INFO L93 Difference]: Finished difference Result 374 states and 436 transitions. [2018-11-07 05:06:37,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 05:06:37,202 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 89 [2018-11-07 05:06:37,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:37,204 INFO L225 Difference]: With dead ends: 374 [2018-11-07 05:06:37,204 INFO L226 Difference]: Without dead ends: 333 [2018-11-07 05:06:37,205 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 148 SyntacticMatches, 18 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1696 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=867, Invalid=3689, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 05:06:37,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2018-11-07 05:06:37,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 115. [2018-11-07 05:06:37,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 05:06:37,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-11-07 05:06:37,313 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-11-07 05:06:37,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:37,314 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-11-07 05:06:37,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 05:06:37,314 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-11-07 05:06:37,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 05:06:37,315 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:37,315 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 6, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:37,315 INFO L423 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:37,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:37,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1822167487, now seen corresponding path program 20 times [2018-11-07 05:06:37,315 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:37,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:37,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:37,316 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:37,316 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:37,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:37,797 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:37,797 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:37,797 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:37,798 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:37,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:37,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:37,798 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:37,806 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:37,807 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:37,839 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-07 05:06:37,839 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:37,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:38,330 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:38,330 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:38,500 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 119 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:38,520 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:38,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 33 [2018-11-07 05:06:38,520 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:38,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 05:06:38,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 05:06:38,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 05:06:38,522 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 33 states. [2018-11-07 05:06:39,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:39,669 INFO L93 Difference]: Finished difference Result 412 states and 483 transitions. [2018-11-07 05:06:39,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 05:06:39,669 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 89 [2018-11-07 05:06:39,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:39,671 INFO L225 Difference]: With dead ends: 412 [2018-11-07 05:06:39,671 INFO L226 Difference]: Without dead ends: 371 [2018-11-07 05:06:39,672 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 149 SyntacticMatches, 18 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1572 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=823, Invalid=3467, Unknown=0, NotChecked=0, Total=4290 [2018-11-07 05:06:39,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2018-11-07 05:06:39,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 115. [2018-11-07 05:06:39,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 05:06:39,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-11-07 05:06:39,766 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-11-07 05:06:39,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:39,767 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-11-07 05:06:39,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 05:06:39,767 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-11-07 05:06:39,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 05:06:39,767 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:39,767 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:39,768 INFO L423 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:39,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:39,768 INFO L82 PathProgramCache]: Analyzing trace with hash 1890859851, now seen corresponding path program 21 times [2018-11-07 05:06:39,768 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:39,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:39,769 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:39,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:39,769 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:39,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:39,992 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:39,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:39,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:39,993 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:39,993 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:39,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:39,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:40,002 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:40,002 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:40,028 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:40,028 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:40,031 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:40,518 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:40,518 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:40,721 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 119 proven. 44 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:40,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:40,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2018-11-07 05:06:40,741 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:40,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 05:06:40,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 05:06:40,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=785, Unknown=0, NotChecked=0, Total=992 [2018-11-07 05:06:40,741 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 32 states. [2018-11-07 05:06:42,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:42,099 INFO L93 Difference]: Finished difference Result 448 states and 528 transitions. [2018-11-07 05:06:42,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 05:06:42,099 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 89 [2018-11-07 05:06:42,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:42,102 INFO L225 Difference]: With dead ends: 448 [2018-11-07 05:06:42,102 INFO L226 Difference]: Without dead ends: 407 [2018-11-07 05:06:42,103 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 150 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1354 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=741, Invalid=3041, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 05:06:42,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2018-11-07 05:06:42,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 115. [2018-11-07 05:06:42,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 05:06:42,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-11-07 05:06:42,188 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 89 [2018-11-07 05:06:42,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:42,188 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-11-07 05:06:42,188 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 05:06:42,189 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-11-07 05:06:42,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 05:06:42,189 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:42,189 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:42,189 INFO L423 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:42,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:42,190 INFO L82 PathProgramCache]: Analyzing trace with hash 2074171351, now seen corresponding path program 7 times [2018-11-07 05:06:42,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:42,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:42,190 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:42,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:42,190 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:42,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:42,581 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:42,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:42,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:42,582 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:42,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:42,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:42,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:42,591 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:42,592 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:42,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:42,618 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:42,828 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:42,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:43,090 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:43,109 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:43,110 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-11-07 05:06:43,110 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:43,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 05:06:43,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 05:06:43,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=723, Unknown=0, NotChecked=0, Total=930 [2018-11-07 05:06:43,111 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 31 states. [2018-11-07 05:06:44,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:44,449 INFO L93 Difference]: Finished difference Result 487 states and 577 transitions. [2018-11-07 05:06:44,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 05:06:44,449 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 89 [2018-11-07 05:06:44,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:44,451 INFO L225 Difference]: With dead ends: 487 [2018-11-07 05:06:44,451 INFO L226 Difference]: Without dead ends: 446 [2018-11-07 05:06:44,452 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 151 SyntacticMatches, 18 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1056 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=633, Invalid=2447, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 05:06:44,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2018-11-07 05:06:44,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 118. [2018-11-07 05:06:44,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-11-07 05:06:44,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 128 transitions. [2018-11-07 05:06:44,546 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 128 transitions. Word has length 89 [2018-11-07 05:06:44,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:44,546 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 128 transitions. [2018-11-07 05:06:44,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 05:06:44,546 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 128 transitions. [2018-11-07 05:06:44,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-11-07 05:06:44,547 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:44,547 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:44,547 INFO L423 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:44,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:44,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1421446787, now seen corresponding path program 14 times [2018-11-07 05:06:44,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:44,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:44,549 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:44,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:44,549 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:44,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:44,836 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 05:06:44,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:44,836 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:44,836 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:44,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:44,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:44,837 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:44,844 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:44,845 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:44,876 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 05:06:44,876 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:44,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:44,913 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:44,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:45,015 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 05:06:45,035 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:45,035 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2018-11-07 05:06:45,035 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:45,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 05:06:45,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 05:06:45,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-11-07 05:06:45,036 INFO L87 Difference]: Start difference. First operand 118 states and 128 transitions. Second operand 16 states. [2018-11-07 05:06:45,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:45,312 INFO L93 Difference]: Finished difference Result 128 states and 138 transitions. [2018-11-07 05:06:45,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 05:06:45,313 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 91 [2018-11-07 05:06:45,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:45,314 INFO L225 Difference]: With dead ends: 128 [2018-11-07 05:06:45,314 INFO L226 Difference]: Without dead ends: 126 [2018-11-07 05:06:45,314 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 173 SyntacticMatches, 17 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-11-07 05:06:45,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-11-07 05:06:45,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-11-07 05:06:45,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-11-07 05:06:45,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 136 transitions. [2018-11-07 05:06:45,394 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 136 transitions. Word has length 91 [2018-11-07 05:06:45,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:45,394 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 136 transitions. [2018-11-07 05:06:45,394 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 05:06:45,394 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 136 transitions. [2018-11-07 05:06:45,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 05:06:45,395 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:45,395 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:45,395 INFO L423 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:45,395 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:45,396 INFO L82 PathProgramCache]: Analyzing trace with hash -161069919, now seen corresponding path program 15 times [2018-11-07 05:06:45,396 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:45,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:45,396 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:45,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:45,396 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:45,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:45,861 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:45,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:45,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:45,862 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:45,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:45,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:45,862 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:45,873 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:45,873 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:45,898 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:45,898 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:45,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:47,422 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:47,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:47,587 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:47,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:47,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 42 [2018-11-07 05:06:47,608 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:47,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 05:06:47,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 05:06:47,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=1369, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 05:06:47,609 INFO L87 Difference]: Start difference. First operand 126 states and 136 transitions. Second operand 42 states. [2018-11-07 05:06:48,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:48,483 INFO L93 Difference]: Finished difference Result 225 states and 254 transitions. [2018-11-07 05:06:48,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-11-07 05:06:48,483 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 99 [2018-11-07 05:06:48,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:48,484 INFO L225 Difference]: With dead ends: 225 [2018-11-07 05:06:48,484 INFO L226 Difference]: Without dead ends: 180 [2018-11-07 05:06:48,485 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 160 SyntacticMatches, 20 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1688 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=763, Invalid=3019, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 05:06:48,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-11-07 05:06:48,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 128. [2018-11-07 05:06:48,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 05:06:48,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-11-07 05:06:48,572 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-11-07 05:06:48,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:48,572 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-11-07 05:06:48,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 05:06:48,573 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-11-07 05:06:48,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 05:06:48,573 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:48,573 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:48,574 INFO L423 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:48,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:48,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1635135533, now seen corresponding path program 22 times [2018-11-07 05:06:48,574 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:48,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:48,575 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:48,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:48,575 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:48,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:49,180 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:49,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:49,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:49,180 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:49,180 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:49,180 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:49,180 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:49,188 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:49,188 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:49,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:49,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:49,552 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:49,553 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:49,722 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:49,741 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:49,741 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 41 [2018-11-07 05:06:49,741 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:49,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-07 05:06:49,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-07 05:06:49,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=1314, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 05:06:49,742 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 41 states. [2018-11-07 05:06:50,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:50,792 INFO L93 Difference]: Finished difference Result 277 states and 316 transitions. [2018-11-07 05:06:50,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 05:06:50,792 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 99 [2018-11-07 05:06:50,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:50,793 INFO L225 Difference]: With dead ends: 277 [2018-11-07 05:06:50,794 INFO L226 Difference]: Without dead ends: 232 [2018-11-07 05:06:50,794 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 161 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1944 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=903, Invalid=3789, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 05:06:50,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-11-07 05:06:50,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 128. [2018-11-07 05:06:50,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 05:06:50,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-11-07 05:06:50,947 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-11-07 05:06:50,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:50,947 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-11-07 05:06:50,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-07 05:06:50,947 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-11-07 05:06:50,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 05:06:50,948 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:50,948 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 7, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:50,948 INFO L423 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:50,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:50,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1382256313, now seen corresponding path program 23 times [2018-11-07 05:06:50,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:50,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:50,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:50,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:50,951 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:50,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:51,336 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:51,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:51,336 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:51,337 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:51,337 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:51,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:51,337 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:51,366 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:06:51,367 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:06:51,402 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 05:06:51,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:51,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:53,161 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:53,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:53,665 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:53,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:53,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 40 [2018-11-07 05:06:53,686 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:53,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 05:06:53,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 05:06:53,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=1257, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 05:06:53,687 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 40 states. [2018-11-07 05:06:54,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:54,884 INFO L93 Difference]: Finished difference Result 327 states and 376 transitions. [2018-11-07 05:06:54,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 05:06:54,884 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 99 [2018-11-07 05:06:54,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:54,885 INFO L225 Difference]: With dead ends: 327 [2018-11-07 05:06:54,885 INFO L226 Difference]: Without dead ends: 282 [2018-11-07 05:06:54,886 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 162 SyntacticMatches, 20 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2151 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1018, Invalid=4384, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 05:06:54,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2018-11-07 05:06:54,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 128. [2018-11-07 05:06:54,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 05:06:54,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-11-07 05:06:54,979 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-11-07 05:06:54,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:54,980 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-11-07 05:06:54,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 05:06:54,980 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-11-07 05:06:54,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 05:06:54,980 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:54,980 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:54,981 INFO L423 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:54,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:54,981 INFO L82 PathProgramCache]: Analyzing trace with hash 2012160069, now seen corresponding path program 24 times [2018-11-07 05:06:54,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:54,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:54,981 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:54,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:54,982 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:54,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:55,291 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:55,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:55,291 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:55,291 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:55,291 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:55,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:55,291 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:55,300 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:06:55,300 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:06:55,324 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:06:55,324 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:06:55,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:55,635 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:55,636 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:55,798 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:55,817 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:55,817 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 39 [2018-11-07 05:06:55,817 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:55,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 05:06:55,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 05:06:55,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=1198, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 05:06:55,818 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 39 states. [2018-11-07 05:06:57,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:06:57,253 INFO L93 Difference]: Finished difference Result 375 states and 434 transitions. [2018-11-07 05:06:57,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 05:06:57,253 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 99 [2018-11-07 05:06:57,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:06:57,255 INFO L225 Difference]: With dead ends: 375 [2018-11-07 05:06:57,255 INFO L226 Difference]: Without dead ends: 330 [2018-11-07 05:06:57,256 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 163 SyntacticMatches, 20 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1093, Invalid=4759, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 05:06:57,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2018-11-07 05:06:57,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 128. [2018-11-07 05:06:57,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 05:06:57,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-11-07 05:06:57,380 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-11-07 05:06:57,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:06:57,380 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-11-07 05:06:57,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 05:06:57,381 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-11-07 05:06:57,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 05:06:57,381 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:06:57,381 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:06:57,381 INFO L423 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:06:57,382 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:06:57,382 INFO L82 PathProgramCache]: Analyzing trace with hash -1173773103, now seen corresponding path program 25 times [2018-11-07 05:06:57,382 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:06:57,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:57,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:06:57,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:06:57,383 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:06:57,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:57,710 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 152 proven. 40 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:57,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:57,711 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:06:57,711 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:06:57,711 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:06:57,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:06:57,711 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:06:57,720 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:06:57,720 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:06:57,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:06:57,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:06:58,222 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 152 proven. 40 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:58,222 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:06:58,677 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 152 proven. 40 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:06:58,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:06:58,697 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 38 [2018-11-07 05:06:58,697 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:06:58,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-11-07 05:06:58,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-11-07 05:06:58,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=1137, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 05:06:58,698 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 38 states. [2018-11-07 05:07:00,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:00,161 INFO L93 Difference]: Finished difference Result 421 states and 490 transitions. [2018-11-07 05:07:00,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 05:07:00,162 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 99 [2018-11-07 05:07:00,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:00,163 INFO L225 Difference]: With dead ends: 421 [2018-11-07 05:07:00,163 INFO L226 Difference]: Without dead ends: 376 [2018-11-07 05:07:00,165 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 164 SyntacticMatches, 20 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2302 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1119, Invalid=4887, Unknown=0, NotChecked=0, Total=6006 [2018-11-07 05:07:00,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2018-11-07 05:07:00,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 128. [2018-11-07 05:07:00,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 05:07:00,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-11-07 05:07:00,284 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-11-07 05:07:00,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:00,284 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-11-07 05:07:00,284 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-11-07 05:07:00,284 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-11-07 05:07:00,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 05:07:00,285 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:00,285 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:00,285 INFO L423 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:00,285 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:00,285 INFO L82 PathProgramCache]: Analyzing trace with hash -975971235, now seen corresponding path program 26 times [2018-11-07 05:07:00,285 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:00,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:00,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:00,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:00,286 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:00,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:00,550 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:00,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:00,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:00,550 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:00,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:00,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:00,551 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:00,561 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:07:00,561 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:07:00,592 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 05:07:00,593 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:00,596 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:00,932 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:00,933 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:01,087 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 152 proven. 42 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:01,107 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:01,108 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 37 [2018-11-07 05:07:01,108 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:01,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 05:07:01,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 05:07:01,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=1074, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 05:07:01,109 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 37 states. [2018-11-07 05:07:02,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:02,635 INFO L93 Difference]: Finished difference Result 465 states and 544 transitions. [2018-11-07 05:07:02,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-11-07 05:07:02,637 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 99 [2018-11-07 05:07:02,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:02,639 INFO L225 Difference]: With dead ends: 465 [2018-11-07 05:07:02,639 INFO L226 Difference]: Without dead ends: 420 [2018-11-07 05:07:02,641 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 165 SyntacticMatches, 20 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2217 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1093, Invalid=4759, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 05:07:02,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2018-11-07 05:07:02,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 128. [2018-11-07 05:07:02,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 05:07:02,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-11-07 05:07:02,762 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-11-07 05:07:02,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:02,762 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-11-07 05:07:02,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 05:07:02,762 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-11-07 05:07:02,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 05:07:02,763 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:02,763 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 7, 6, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:02,763 INFO L423 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:02,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:02,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1717664023, now seen corresponding path program 27 times [2018-11-07 05:07:02,764 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:02,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:02,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:02,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:02,765 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:02,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:03,191 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:03,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:03,192 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:03,192 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:03,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:03,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:03,192 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:03,200 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:07:03,200 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:07:03,229 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:07:03,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:03,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:03,761 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:03,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:04,001 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 152 proven. 48 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:04,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:04,021 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 36 [2018-11-07 05:07:04,022 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:04,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 05:07:04,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 05:07:04,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1009, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 05:07:04,022 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 36 states. [2018-11-07 05:07:05,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:05,679 INFO L93 Difference]: Finished difference Result 507 states and 596 transitions. [2018-11-07 05:07:05,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 05:07:05,679 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 99 [2018-11-07 05:07:05,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:05,681 INFO L225 Difference]: With dead ends: 507 [2018-11-07 05:07:05,681 INFO L226 Difference]: Without dead ends: 462 [2018-11-07 05:07:05,682 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 166 SyntacticMatches, 20 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2019 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1018, Invalid=4384, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 05:07:05,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2018-11-07 05:07:05,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 128. [2018-11-07 05:07:05,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 05:07:05,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-11-07 05:07:05,806 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-11-07 05:07:05,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:05,806 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-11-07 05:07:05,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 05:07:05,807 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-11-07 05:07:05,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 05:07:05,807 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:05,807 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:05,807 INFO L423 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:05,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:05,808 INFO L82 PathProgramCache]: Analyzing trace with hash 283796597, now seen corresponding path program 28 times [2018-11-07 05:07:05,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:05,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:05,808 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:05,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:05,808 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:05,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:06,648 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:06,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:06,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:06,649 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:06,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:06,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:06,649 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:06,660 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:06,660 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:07:06,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:06,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:06,995 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:06,995 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:07,280 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 152 proven. 58 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:07,299 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:07,299 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2018-11-07 05:07:07,300 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:07,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 05:07:07,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 05:07:07,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=942, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 05:07:07,301 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 35 states. [2018-11-07 05:07:09,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:09,095 INFO L93 Difference]: Finished difference Result 547 states and 646 transitions. [2018-11-07 05:07:09,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 05:07:09,096 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 99 [2018-11-07 05:07:09,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:09,098 INFO L225 Difference]: With dead ends: 547 [2018-11-07 05:07:09,098 INFO L226 Difference]: Without dead ends: 502 [2018-11-07 05:07:09,099 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 167 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1716 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=903, Invalid=3789, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 05:07:09,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2018-11-07 05:07:09,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 128. [2018-11-07 05:07:09,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-11-07 05:07:09,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2018-11-07 05:07:09,240 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 99 [2018-11-07 05:07:09,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:09,240 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2018-11-07 05:07:09,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 05:07:09,240 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2018-11-07 05:07:09,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-11-07 05:07:09,241 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:09,241 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:09,241 INFO L423 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:09,241 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:09,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1885877505, now seen corresponding path program 8 times [2018-11-07 05:07:09,242 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:09,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:09,242 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:09,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:09,242 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:09,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:12,619 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:12,619 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:12,619 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:12,620 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:12,620 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:12,620 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:12,620 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:12,628 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:07:12,628 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:07:12,662 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 05:07:12,663 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:12,665 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:12,903 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:12,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:13,061 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:13,080 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:13,080 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 34 [2018-11-07 05:07:13,080 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:13,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 05:07:13,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 05:07:13,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=873, Unknown=0, NotChecked=0, Total=1122 [2018-11-07 05:07:13,081 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand 34 states. [2018-11-07 05:07:14,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:14,838 INFO L93 Difference]: Finished difference Result 590 states and 700 transitions. [2018-11-07 05:07:14,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 05:07:14,838 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2018-11-07 05:07:14,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:14,840 INFO L225 Difference]: With dead ends: 590 [2018-11-07 05:07:14,840 INFO L226 Difference]: Without dead ends: 545 [2018-11-07 05:07:14,841 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 168 SyntacticMatches, 20 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1328 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=763, Invalid=3019, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 05:07:14,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 545 states. [2018-11-07 05:07:14,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 545 to 131. [2018-11-07 05:07:14,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-11-07 05:07:14,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 142 transitions. [2018-11-07 05:07:14,961 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 142 transitions. Word has length 99 [2018-11-07 05:07:14,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:14,961 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 142 transitions. [2018-11-07 05:07:14,961 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 05:07:14,962 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 142 transitions. [2018-11-07 05:07:14,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-11-07 05:07:14,962 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:14,962 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:14,962 INFO L423 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:14,963 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:14,963 INFO L82 PathProgramCache]: Analyzing trace with hash -1743772005, now seen corresponding path program 16 times [2018-11-07 05:07:14,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:14,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:14,964 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:14,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:14,964 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:14,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:15,331 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-07 05:07:15,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:15,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:15,331 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:15,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:15,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:15,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:15,341 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:15,341 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:07:15,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:15,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:15,419 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:15,419 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:15,522 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-11-07 05:07:15,541 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:15,542 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2018-11-07 05:07:15,542 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:15,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 05:07:15,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 05:07:15,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-11-07 05:07:15,542 INFO L87 Difference]: Start difference. First operand 131 states and 142 transitions. Second operand 17 states. [2018-11-07 05:07:15,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:15,885 INFO L93 Difference]: Finished difference Result 141 states and 152 transitions. [2018-11-07 05:07:15,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 05:07:15,886 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 101 [2018-11-07 05:07:15,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:15,887 INFO L225 Difference]: With dead ends: 141 [2018-11-07 05:07:15,887 INFO L226 Difference]: Without dead ends: 139 [2018-11-07 05:07:15,888 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 192 SyntacticMatches, 19 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-11-07 05:07:15,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-11-07 05:07:16,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-11-07 05:07:16,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-11-07 05:07:16,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-11-07 05:07:16,001 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 101 [2018-11-07 05:07:16,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:16,002 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-11-07 05:07:16,002 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 05:07:16,002 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-11-07 05:07:16,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:16,002 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:16,002 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:16,002 INFO L423 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:16,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:16,003 INFO L82 PathProgramCache]: Analyzing trace with hash -860881985, now seen corresponding path program 17 times [2018-11-07 05:07:16,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:16,003 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:16,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:16,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:16,004 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:16,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:16,326 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:16,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:16,326 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:16,326 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:16,326 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:16,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:16,326 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:16,334 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:07:16,334 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:07:16,369 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-07 05:07:16,369 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:16,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:16,799 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:16,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:16,999 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:17,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:17,019 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 46 [2018-11-07 05:07:17,019 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:17,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 05:07:17,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 05:07:17,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=1649, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 05:07:17,020 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 46 states. [2018-11-07 05:07:17,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:17,871 INFO L93 Difference]: Finished difference Result 248 states and 280 transitions. [2018-11-07 05:07:17,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 05:07:17,871 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 109 [2018-11-07 05:07:17,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:17,872 INFO L225 Difference]: With dead ends: 248 [2018-11-07 05:07:17,872 INFO L226 Difference]: Without dead ends: 199 [2018-11-07 05:07:17,873 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 176 SyntacticMatches, 22 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2081 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=905, Invalid=3651, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 05:07:17,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-11-07 05:07:18,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 141. [2018-11-07 05:07:18,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 05:07:18,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-11-07 05:07:18,010 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-11-07 05:07:18,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:18,011 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-11-07 05:07:18,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 05:07:18,011 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-11-07 05:07:18,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:18,011 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:18,011 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:18,011 INFO L423 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:18,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:18,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1311238219, now seen corresponding path program 29 times [2018-11-07 05:07:18,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:18,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:18,012 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:18,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:18,012 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:18,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:18,262 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:18,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:18,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:18,263 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:18,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:18,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:18,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:18,275 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:07:18,275 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:07:18,312 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-07 05:07:18,312 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:18,316 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:18,768 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:18,769 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:19,250 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:19,270 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:19,270 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 45 [2018-11-07 05:07:19,270 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:19,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 05:07:19,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 05:07:19,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=391, Invalid=1589, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 05:07:19,271 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 45 states. [2018-11-07 05:07:20,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:20,598 INFO L93 Difference]: Finished difference Result 306 states and 349 transitions. [2018-11-07 05:07:20,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 05:07:20,598 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 109 [2018-11-07 05:07:20,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:20,599 INFO L225 Difference]: With dead ends: 306 [2018-11-07 05:07:20,599 INFO L226 Difference]: Without dead ends: 257 [2018-11-07 05:07:20,600 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 177 SyntacticMatches, 22 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2415 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1081, Invalid=4619, Unknown=0, NotChecked=0, Total=5700 [2018-11-07 05:07:20,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-11-07 05:07:20,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 141. [2018-11-07 05:07:20,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 05:07:20,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-11-07 05:07:20,753 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-11-07 05:07:20,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:20,753 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-11-07 05:07:20,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 05:07:20,753 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-11-07 05:07:20,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:20,753 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:20,754 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 8, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:20,754 INFO L423 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:20,754 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:20,754 INFO L82 PathProgramCache]: Analyzing trace with hash 562661335, now seen corresponding path program 30 times [2018-11-07 05:07:20,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:20,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:20,755 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:20,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:20,755 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:20,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:22,003 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:22,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:22,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:22,004 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:22,004 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:22,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:22,004 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:22,014 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:07:22,014 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:07:22,045 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:07:22,045 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:22,047 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:22,433 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:22,433 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:22,621 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:22,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:22,640 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 44 [2018-11-07 05:07:22,640 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:22,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 05:07:22,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 05:07:22,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=1527, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 05:07:22,641 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 44 states. [2018-11-07 05:07:24,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:24,462 INFO L93 Difference]: Finished difference Result 362 states and 416 transitions. [2018-11-07 05:07:24,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 05:07:24,463 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 109 [2018-11-07 05:07:24,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:24,464 INFO L225 Difference]: With dead ends: 362 [2018-11-07 05:07:24,464 INFO L226 Difference]: Without dead ends: 313 [2018-11-07 05:07:24,465 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 178 SyntacticMatches, 22 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2703 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1234, Invalid=5408, Unknown=0, NotChecked=0, Total=6642 [2018-11-07 05:07:24,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2018-11-07 05:07:24,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 141. [2018-11-07 05:07:24,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 05:07:24,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-11-07 05:07:24,624 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-11-07 05:07:24,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:24,624 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-11-07 05:07:24,624 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-07 05:07:24,624 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-11-07 05:07:24,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:24,625 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:24,625 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 7, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:24,625 INFO L423 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:24,625 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:24,625 INFO L82 PathProgramCache]: Analyzing trace with hash 195402339, now seen corresponding path program 31 times [2018-11-07 05:07:24,625 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:24,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:24,626 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:24,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:24,626 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:24,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:24,859 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:24,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:24,859 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:24,859 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:24,860 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:24,860 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:24,860 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:24,868 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:24,868 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:07:24,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:24,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:25,332 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:25,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:25,523 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:25,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:25,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 43 [2018-11-07 05:07:25,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:25,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 05:07:25,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 05:07:25,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=1463, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 05:07:25,544 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 43 states. [2018-11-07 05:07:27,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:27,400 INFO L93 Difference]: Finished difference Result 416 states and 481 transitions. [2018-11-07 05:07:27,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 05:07:27,400 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 109 [2018-11-07 05:07:27,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:27,402 INFO L225 Difference]: With dead ends: 416 [2018-11-07 05:07:27,402 INFO L226 Difference]: Without dead ends: 367 [2018-11-07 05:07:27,403 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 179 SyntacticMatches, 22 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2907 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1346, Invalid=5964, Unknown=0, NotChecked=0, Total=7310 [2018-11-07 05:07:27,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-11-07 05:07:27,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 141. [2018-11-07 05:07:27,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 05:07:27,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-11-07 05:07:27,620 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-11-07 05:07:27,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:27,620 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-11-07 05:07:27,620 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 05:07:27,620 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-11-07 05:07:27,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:27,621 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:27,621 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:27,621 INFO L423 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:27,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:27,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1316806639, now seen corresponding path program 32 times [2018-11-07 05:07:27,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:27,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:27,622 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:27,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:27,622 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:27,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:27,876 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:27,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:27,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:27,876 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:27,876 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:27,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:27,877 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:27,884 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:07:27,884 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:07:27,920 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-07 05:07:27,920 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:27,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:28,281 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:28,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:28,472 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:28,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:28,493 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 42 [2018-11-07 05:07:28,493 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:28,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 05:07:28,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 05:07:28,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=1397, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 05:07:28,494 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 42 states. [2018-11-07 05:07:30,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:30,631 INFO L93 Difference]: Finished difference Result 468 states and 544 transitions. [2018-11-07 05:07:30,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-07 05:07:30,632 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 109 [2018-11-07 05:07:30,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:30,633 INFO L225 Difference]: With dead ends: 468 [2018-11-07 05:07:30,633 INFO L226 Difference]: Without dead ends: 419 [2018-11-07 05:07:30,634 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 180 SyntacticMatches, 22 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3001 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1405, Invalid=6251, Unknown=0, NotChecked=0, Total=7656 [2018-11-07 05:07:30,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2018-11-07 05:07:30,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 141. [2018-11-07 05:07:30,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 05:07:30,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-11-07 05:07:30,832 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-11-07 05:07:30,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:30,832 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-11-07 05:07:30,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 05:07:30,832 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-11-07 05:07:30,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:30,833 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:30,833 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:30,833 INFO L423 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:30,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:30,833 INFO L82 PathProgramCache]: Analyzing trace with hash 893393019, now seen corresponding path program 33 times [2018-11-07 05:07:30,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:30,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:30,834 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:30,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:30,834 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:30,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:31,116 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:31,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:31,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:31,117 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:31,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:31,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:31,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:31,127 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:07:31,127 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:07:31,181 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:07:31,181 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:31,184 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:31,811 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:31,811 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:32,005 INFO L134 CoverageAnalysis]: Checked inductivity of 383 backedges. 189 proven. 50 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:32,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:32,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 41 [2018-11-07 05:07:32,025 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:32,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-07 05:07:32,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-07 05:07:32,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=1329, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 05:07:32,026 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 41 states. [2018-11-07 05:07:33,670 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-11-07 05:07:34,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:34,733 INFO L93 Difference]: Finished difference Result 518 states and 605 transitions. [2018-11-07 05:07:34,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-07 05:07:34,734 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 109 [2018-11-07 05:07:34,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:34,736 INFO L225 Difference]: With dead ends: 518 [2018-11-07 05:07:34,736 INFO L226 Difference]: Without dead ends: 469 [2018-11-07 05:07:34,737 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 181 SyntacticMatches, 22 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2971 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1405, Invalid=6251, Unknown=0, NotChecked=0, Total=7656 [2018-11-07 05:07:34,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2018-11-07 05:07:34,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 141. [2018-11-07 05:07:34,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 05:07:34,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-11-07 05:07:34,898 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-11-07 05:07:34,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:34,898 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-11-07 05:07:34,898 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-07 05:07:34,898 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-11-07 05:07:34,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:34,899 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:34,899 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 7, 6, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:34,899 INFO L423 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:34,899 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:34,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1605368825, now seen corresponding path program 34 times [2018-11-07 05:07:34,900 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:34,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:34,900 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:34,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:34,901 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:34,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:35,189 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:35,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:35,189 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:35,189 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:35,189 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:35,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:35,190 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:35,199 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:35,200 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:07:35,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:35,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:35,633 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:35,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:35,819 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 189 proven. 54 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:35,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:35,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 40 [2018-11-07 05:07:35,839 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:35,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 05:07:35,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 05:07:35,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=1259, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 05:07:35,840 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 40 states. [2018-11-07 05:07:38,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:38,166 INFO L93 Difference]: Finished difference Result 566 states and 664 transitions. [2018-11-07 05:07:38,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-07 05:07:38,166 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 109 [2018-11-07 05:07:38,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:38,168 INFO L225 Difference]: With dead ends: 566 [2018-11-07 05:07:38,168 INFO L226 Difference]: Without dead ends: 517 [2018-11-07 05:07:38,169 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 182 SyntacticMatches, 22 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2811 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1346, Invalid=5964, Unknown=0, NotChecked=0, Total=7310 [2018-11-07 05:07:38,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2018-11-07 05:07:38,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 141. [2018-11-07 05:07:38,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 05:07:38,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-11-07 05:07:38,328 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-11-07 05:07:38,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:38,328 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-11-07 05:07:38,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 05:07:38,328 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-11-07 05:07:38,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:38,329 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:38,329 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 8, 7, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:38,329 INFO L423 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:38,329 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:38,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1858248045, now seen corresponding path program 35 times [2018-11-07 05:07:38,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:38,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:38,330 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:38,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:38,330 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:38,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:38,571 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:38,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:38,572 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:38,572 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:38,572 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:38,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:38,572 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:38,582 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:07:38,583 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:07:38,619 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-07 05:07:38,619 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:38,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:38,952 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:38,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:39,143 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 189 proven. 62 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:39,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:39,163 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 39 [2018-11-07 05:07:39,163 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:39,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 05:07:39,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 05:07:39,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=1187, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 05:07:39,164 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 39 states. [2018-11-07 05:07:41,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:41,546 INFO L93 Difference]: Finished difference Result 612 states and 721 transitions. [2018-11-07 05:07:41,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-11-07 05:07:41,547 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 109 [2018-11-07 05:07:41,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:41,549 INFO L225 Difference]: With dead ends: 612 [2018-11-07 05:07:41,549 INFO L226 Difference]: Without dead ends: 563 [2018-11-07 05:07:41,550 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 183 SyntacticMatches, 22 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2523 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1234, Invalid=5408, Unknown=0, NotChecked=0, Total=6642 [2018-11-07 05:07:41,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2018-11-07 05:07:41,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 141. [2018-11-07 05:07:41,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 05:07:41,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-11-07 05:07:41,719 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-11-07 05:07:41,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:41,719 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-11-07 05:07:41,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 05:07:41,719 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-11-07 05:07:41,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:41,720 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:41,720 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:41,720 INFO L423 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:41,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:41,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1228344289, now seen corresponding path program 36 times [2018-11-07 05:07:41,721 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:41,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:41,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:41,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:41,721 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:41,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:41,953 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:41,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:41,953 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:41,953 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:41,954 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:41,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:41,954 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:41,969 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:07:41,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:07:42,023 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:07:42,023 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:42,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:42,328 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:42,328 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:42,512 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 189 proven. 74 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:42,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:42,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2018-11-07 05:07:42,533 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:42,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-11-07 05:07:42,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-11-07 05:07:42,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=1113, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 05:07:42,534 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 38 states. [2018-11-07 05:07:44,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:44,911 INFO L93 Difference]: Finished difference Result 656 states and 776 transitions. [2018-11-07 05:07:44,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 05:07:44,911 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 109 [2018-11-07 05:07:44,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:44,914 INFO L225 Difference]: With dead ends: 656 [2018-11-07 05:07:44,914 INFO L226 Difference]: Without dead ends: 607 [2018-11-07 05:07:44,915 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 184 SyntacticMatches, 22 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2121 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1081, Invalid=4619, Unknown=0, NotChecked=0, Total=5700 [2018-11-07 05:07:44,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2018-11-07 05:07:45,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 141. [2018-11-07 05:07:45,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-11-07 05:07:45,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2018-11-07 05:07:45,104 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 109 [2018-11-07 05:07:45,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:45,104 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2018-11-07 05:07:45,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-11-07 05:07:45,104 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2018-11-07 05:07:45,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 05:07:45,105 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:45,105 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:45,105 INFO L423 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:45,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:45,105 INFO L82 PathProgramCache]: Analyzing trace with hash -119310165, now seen corresponding path program 9 times [2018-11-07 05:07:45,105 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:45,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:45,106 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:45,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:45,106 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:45,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:45,371 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:45,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:45,372 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:45,372 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:45,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:45,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:45,372 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:45,382 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:07:45,382 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:07:45,407 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:07:45,408 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:45,409 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:45,739 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:45,739 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:46,161 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:46,180 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:46,181 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-11-07 05:07:46,181 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:46,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 05:07:46,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 05:07:46,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=295, Invalid=1037, Unknown=0, NotChecked=0, Total=1332 [2018-11-07 05:07:46,182 INFO L87 Difference]: Start difference. First operand 141 states and 152 transitions. Second operand 37 states. [2018-11-07 05:07:48,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:48,420 INFO L93 Difference]: Finished difference Result 703 states and 835 transitions. [2018-11-07 05:07:48,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 05:07:48,428 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 109 [2018-11-07 05:07:48,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:48,431 INFO L225 Difference]: With dead ends: 703 [2018-11-07 05:07:48,431 INFO L226 Difference]: Without dead ends: 654 [2018-11-07 05:07:48,432 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 185 SyntacticMatches, 22 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1631 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=905, Invalid=3651, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 05:07:48,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2018-11-07 05:07:48,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 144. [2018-11-07 05:07:48,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-11-07 05:07:48,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 156 transitions. [2018-11-07 05:07:48,608 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 156 transitions. Word has length 109 [2018-11-07 05:07:48,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:48,609 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 156 transitions. [2018-11-07 05:07:48,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 05:07:48,609 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 156 transitions. [2018-11-07 05:07:48,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-11-07 05:07:48,609 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:48,609 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:48,609 INFO L423 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:48,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:48,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1752486599, now seen corresponding path program 18 times [2018-11-07 05:07:48,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:48,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:48,610 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:48,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:48,611 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:48,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:48,740 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 05:07:48,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:48,741 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:48,741 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:48,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:48,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:48,741 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:48,763 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:07:48,763 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:07:48,794 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:07:48,794 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:48,796 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:48,848 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:48,849 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:48,969 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-11-07 05:07:48,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:48,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2018-11-07 05:07:48,989 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:48,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 05:07:48,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 05:07:48,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-11-07 05:07:48,990 INFO L87 Difference]: Start difference. First operand 144 states and 156 transitions. Second operand 18 states. [2018-11-07 05:07:49,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:49,451 INFO L93 Difference]: Finished difference Result 154 states and 166 transitions. [2018-11-07 05:07:49,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 05:07:49,451 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 111 [2018-11-07 05:07:49,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:49,452 INFO L225 Difference]: With dead ends: 154 [2018-11-07 05:07:49,452 INFO L226 Difference]: Without dead ends: 152 [2018-11-07 05:07:49,453 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 211 SyntacticMatches, 21 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-11-07 05:07:49,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-11-07 05:07:49,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2018-11-07 05:07:49,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-11-07 05:07:49,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 164 transitions. [2018-11-07 05:07:49,639 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 164 transitions. Word has length 111 [2018-11-07 05:07:49,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:49,639 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 164 transitions. [2018-11-07 05:07:49,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 05:07:49,639 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 164 transitions. [2018-11-07 05:07:49,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:07:49,640 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:49,640 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:49,640 INFO L423 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:49,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:49,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1040286813, now seen corresponding path program 19 times [2018-11-07 05:07:49,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:49,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:49,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:49,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:49,641 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:49,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:50,084 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:50,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:50,084 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:50,084 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:50,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:50,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:50,085 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:50,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:50,094 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:07:50,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:50,128 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:50,653 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:50,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:50,881 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:50,900 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:50,900 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 50 [2018-11-07 05:07:50,900 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:50,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-11-07 05:07:50,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-11-07 05:07:50,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=495, Invalid=1955, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 05:07:50,901 INFO L87 Difference]: Start difference. First operand 152 states and 164 transitions. Second operand 50 states. [2018-11-07 05:07:52,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:52,144 INFO L93 Difference]: Finished difference Result 271 states and 306 transitions. [2018-11-07 05:07:52,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-11-07 05:07:52,144 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 119 [2018-11-07 05:07:52,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:52,145 INFO L225 Difference]: With dead ends: 271 [2018-11-07 05:07:52,145 INFO L226 Difference]: Without dead ends: 218 [2018-11-07 05:07:52,146 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 192 SyntacticMatches, 24 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2515 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1059, Invalid=4343, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 05:07:52,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2018-11-07 05:07:52,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 154. [2018-11-07 05:07:52,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:07:52,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:07:52,358 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:07:52,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:52,358 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:07:52,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-11-07 05:07:52,358 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:07:52,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:07:52,359 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:52,359 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:52,360 INFO L423 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:52,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:52,360 INFO L82 PathProgramCache]: Analyzing trace with hash -661376535, now seen corresponding path program 37 times [2018-11-07 05:07:52,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:52,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:52,361 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:52,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:52,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:52,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:52,670 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:52,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:52,671 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:52,671 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:52,671 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:52,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:52,671 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:52,680 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:52,681 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:07:52,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:52,717 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:53,207 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:53,207 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:53,532 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:53,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:53,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 49 [2018-11-07 05:07:53,551 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:53,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 05:07:53,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 05:07:53,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=1890, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 05:07:53,552 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 49 states. [2018-11-07 05:07:55,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:55,434 INFO L93 Difference]: Finished difference Result 335 states and 382 transitions. [2018-11-07 05:07:55,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-07 05:07:55,434 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 119 [2018-11-07 05:07:55,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:55,436 INFO L225 Difference]: With dead ends: 335 [2018-11-07 05:07:55,436 INFO L226 Difference]: Without dead ends: 282 [2018-11-07 05:07:55,437 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 193 SyntacticMatches, 24 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2937 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1275, Invalid=5531, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 05:07:55,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2018-11-07 05:07:55,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 154. [2018-11-07 05:07:55,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:07:55,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:07:55,648 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:07:55,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:55,648 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:07:55,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 05:07:55,648 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:07:55,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:07:55,649 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:55,649 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 9, 8, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:55,649 INFO L423 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:55,649 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:55,649 INFO L82 PathProgramCache]: Analyzing trace with hash 516739701, now seen corresponding path program 38 times [2018-11-07 05:07:55,649 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:55,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:55,650 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:07:55,650 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:55,650 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:55,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:55,916 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:55,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:55,916 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:55,917 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:55,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:55,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:55,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:55,927 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:07:55,927 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:07:55,968 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-11-07 05:07:55,968 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:55,971 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:07:56,660 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:56,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:07:56,898 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:56,917 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:07:56,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 48 [2018-11-07 05:07:56,918 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:07:56,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-07 05:07:56,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-07 05:07:56,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=1823, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 05:07:56,919 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 48 states. [2018-11-07 05:07:58,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:07:58,997 INFO L93 Difference]: Finished difference Result 397 states and 456 transitions. [2018-11-07 05:07:58,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 05:07:58,997 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 119 [2018-11-07 05:07:58,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:07:58,999 INFO L225 Difference]: With dead ends: 397 [2018-11-07 05:07:58,999 INFO L226 Difference]: Without dead ends: 344 [2018-11-07 05:07:59,000 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 194 SyntacticMatches, 24 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3318 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1471, Invalid=6539, Unknown=0, NotChecked=0, Total=8010 [2018-11-07 05:07:59,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-11-07 05:07:59,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 154. [2018-11-07 05:07:59,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:07:59,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:07:59,230 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:07:59,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:07:59,230 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:07:59,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-07 05:07:59,230 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:07:59,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:07:59,230 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:07:59,231 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 8, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:07:59,231 INFO L423 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:07:59,231 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:07:59,231 INFO L82 PathProgramCache]: Analyzing trace with hash -1752422911, now seen corresponding path program 39 times [2018-11-07 05:07:59,231 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:07:59,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:59,232 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:07:59,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:07:59,232 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:07:59,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:07:59,500 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:07:59,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:59,500 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:07:59,500 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:07:59,500 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:07:59,501 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:07:59,501 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:07:59,508 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:07:59,509 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:07:59,541 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:07:59,541 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:07:59,544 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:00,443 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:00,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:00,691 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:00,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:00,712 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 47 [2018-11-07 05:08:00,712 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:00,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-11-07 05:08:00,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-11-07 05:08:00,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=1754, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 05:08:00,713 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 47 states. [2018-11-07 05:08:03,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:03,205 INFO L93 Difference]: Finished difference Result 457 states and 528 transitions. [2018-11-07 05:08:03,205 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-11-07 05:08:03,205 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 119 [2018-11-07 05:08:03,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:03,207 INFO L225 Difference]: With dead ends: 457 [2018-11-07 05:08:03,207 INFO L226 Difference]: Without dead ends: 404 [2018-11-07 05:08:03,208 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 195 SyntacticMatches, 24 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3614 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1626, Invalid=7304, Unknown=0, NotChecked=0, Total=8930 [2018-11-07 05:08:03,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2018-11-07 05:08:03,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 154. [2018-11-07 05:08:03,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:08:03,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:08:03,434 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:08:03,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:03,434 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:08:03,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-11-07 05:08:03,434 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:08:03,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:08:03,435 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:03,435 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 7, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:03,435 INFO L423 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:03,435 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:03,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1964839795, now seen corresponding path program 40 times [2018-11-07 05:08:03,435 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:03,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:03,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:08:03,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:03,436 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:03,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:03,742 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:03,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:03,743 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:03,743 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:03,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:03,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:03,743 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:03,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:08:03,752 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:08:03,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:03,786 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:04,824 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:04,825 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:05,302 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:05,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:05,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 46 [2018-11-07 05:08:05,322 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:05,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 05:08:05,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 05:08:05,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=1683, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 05:08:05,323 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 46 states. [2018-11-07 05:08:08,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:08,107 INFO L93 Difference]: Finished difference Result 515 states and 598 transitions. [2018-11-07 05:08:08,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-11-07 05:08:08,107 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 119 [2018-11-07 05:08:08,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:08,110 INFO L225 Difference]: With dead ends: 515 [2018-11-07 05:08:08,110 INFO L226 Difference]: Without dead ends: 462 [2018-11-07 05:08:08,111 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 196 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3793 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1725, Invalid=7781, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 05:08:08,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2018-11-07 05:08:08,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 154. [2018-11-07 05:08:08,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:08:08,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:08:08,342 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:08:08,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:08,342 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:08:08,342 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 05:08:08,342 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:08:08,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:08:08,343 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:08,343 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:08,343 INFO L423 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:08,343 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:08,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1911429607, now seen corresponding path program 41 times [2018-11-07 05:08:08,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:08,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:08,344 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:08:08,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:08,344 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:08,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:08,750 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 230 proven. 60 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:08,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:08,750 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:08,750 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:08,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:08,751 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:08,751 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:08,760 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:08:08,760 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:08:08,801 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-11-07 05:08:08,801 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:08:08,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:09,496 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 230 proven. 60 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:09,496 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:09,713 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 230 proven. 60 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:09,732 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:09,733 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 45 [2018-11-07 05:08:09,733 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:09,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 05:08:09,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 05:08:09,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=1610, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 05:08:09,734 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 45 states. [2018-11-07 05:08:12,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:12,709 INFO L93 Difference]: Finished difference Result 571 states and 666 transitions. [2018-11-07 05:08:12,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-11-07 05:08:12,709 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 119 [2018-11-07 05:08:12,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:12,712 INFO L225 Difference]: With dead ends: 571 [2018-11-07 05:08:12,712 INFO L226 Difference]: Without dead ends: 518 [2018-11-07 05:08:12,714 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 197 SyntacticMatches, 24 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3835 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1759, Invalid=7943, Unknown=0, NotChecked=0, Total=9702 [2018-11-07 05:08:12,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2018-11-07 05:08:12,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 154. [2018-11-07 05:08:12,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:08:12,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:08:12,966 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:08:12,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:12,967 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:08:12,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 05:08:12,967 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:08:12,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:08:12,967 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:12,967 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 7, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:12,968 INFO L423 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:12,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:12,968 INFO L82 PathProgramCache]: Analyzing trace with hash 260690597, now seen corresponding path program 42 times [2018-11-07 05:08:12,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:12,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:12,968 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:08:12,968 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:12,968 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:12,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:13,412 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:13,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:13,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:13,412 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:13,412 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:13,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:13,413 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:13,421 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:08:13,421 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:08:13,453 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:08:13,454 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:08:13,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:13,846 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:13,846 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:14,057 INFO L134 CoverageAnalysis]: Checked inductivity of 472 backedges. 230 proven. 62 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:14,076 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:14,077 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 44 [2018-11-07 05:08:14,077 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:14,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 05:08:14,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 05:08:14,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=1535, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 05:08:14,078 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 44 states. [2018-11-07 05:08:17,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:17,254 INFO L93 Difference]: Finished difference Result 625 states and 732 transitions. [2018-11-07 05:08:17,254 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-11-07 05:08:17,254 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 119 [2018-11-07 05:08:17,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:17,256 INFO L225 Difference]: With dead ends: 625 [2018-11-07 05:08:17,256 INFO L226 Difference]: Without dead ends: 572 [2018-11-07 05:08:17,257 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 198 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3731 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1725, Invalid=7781, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 05:08:17,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2018-11-07 05:08:17,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 154. [2018-11-07 05:08:17,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:08:17,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:08:17,483 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:08:17,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:17,483 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:08:17,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-07 05:08:17,483 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:08:17,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:08:17,484 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:17,484 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 8, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:17,484 INFO L423 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:17,485 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:17,485 INFO L82 PathProgramCache]: Analyzing trace with hash -487886287, now seen corresponding path program 43 times [2018-11-07 05:08:17,485 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:17,485 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:17,485 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:08:17,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:17,486 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:17,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:17,774 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:17,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:17,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:17,775 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:17,775 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:17,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:17,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:17,784 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:08:17,784 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:08:17,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:17,818 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:18,195 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:18,196 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:18,419 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 230 proven. 68 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:18,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:18,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 43 [2018-11-07 05:08:18,438 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:18,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 05:08:18,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 05:08:18,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=348, Invalid=1458, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 05:08:18,439 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 43 states. [2018-11-07 05:08:21,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:21,683 INFO L93 Difference]: Finished difference Result 677 states and 796 transitions. [2018-11-07 05:08:21,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-11-07 05:08:21,684 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 119 [2018-11-07 05:08:21,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:21,686 INFO L225 Difference]: With dead ends: 677 [2018-11-07 05:08:21,687 INFO L226 Difference]: Without dead ends: 624 [2018-11-07 05:08:21,687 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 199 SyntacticMatches, 24 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3478 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1626, Invalid=7304, Unknown=0, NotChecked=0, Total=8930 [2018-11-07 05:08:21,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2018-11-07 05:08:21,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 154. [2018-11-07 05:08:21,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:08:21,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:08:21,947 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:08:21,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:21,947 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:08:21,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 05:08:21,947 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:08:21,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:08:21,948 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:21,948 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 9, 8, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:21,948 INFO L423 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:21,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:21,948 INFO L82 PathProgramCache]: Analyzing trace with hash -855145283, now seen corresponding path program 44 times [2018-11-07 05:08:21,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:21,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:21,949 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:08:21,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:21,950 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:21,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:22,237 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:22,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:22,237 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:22,238 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:22,238 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:22,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:22,238 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:22,245 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:08:22,246 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:08:22,286 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-11-07 05:08:22,287 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:08:22,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:22,653 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:22,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:22,882 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 230 proven. 78 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:22,901 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:22,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 42 [2018-11-07 05:08:22,902 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:22,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-11-07 05:08:22,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-11-07 05:08:22,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=1379, Unknown=0, NotChecked=0, Total=1722 [2018-11-07 05:08:22,903 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 42 states. [2018-11-07 05:08:26,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:26,457 INFO L93 Difference]: Finished difference Result 727 states and 858 transitions. [2018-11-07 05:08:26,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-11-07 05:08:26,457 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 119 [2018-11-07 05:08:26,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:26,460 INFO L225 Difference]: With dead ends: 727 [2018-11-07 05:08:26,460 INFO L226 Difference]: Without dead ends: 674 [2018-11-07 05:08:26,461 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 200 SyntacticMatches, 24 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3084 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1471, Invalid=6539, Unknown=0, NotChecked=0, Total=8010 [2018-11-07 05:08:26,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2018-11-07 05:08:26,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 154. [2018-11-07 05:08:26,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:08:26,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:08:26,723 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:08:26,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:26,723 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:08:26,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-11-07 05:08:26,723 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:08:26,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:08:26,724 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:26,724 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:26,724 INFO L423 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:26,724 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:26,724 INFO L82 PathProgramCache]: Analyzing trace with hash 266259017, now seen corresponding path program 45 times [2018-11-07 05:08:26,724 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:26,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:26,725 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:08:26,725 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:26,725 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:26,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:26,987 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:26,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:26,987 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:26,987 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:26,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:26,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:26,988 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:26,996 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:08:26,996 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:08:27,027 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:08:27,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:08:27,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:27,396 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:27,396 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:28,244 INFO L134 CoverageAnalysis]: Checked inductivity of 502 backedges. 230 proven. 92 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:28,263 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:28,264 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2018-11-07 05:08:28,264 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:28,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-11-07 05:08:28,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-11-07 05:08:28,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=1298, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 05:08:28,265 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 41 states. [2018-11-07 05:08:31,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:31,675 INFO L93 Difference]: Finished difference Result 775 states and 918 transitions. [2018-11-07 05:08:31,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-11-07 05:08:31,676 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 119 [2018-11-07 05:08:31,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:31,679 INFO L225 Difference]: With dead ends: 775 [2018-11-07 05:08:31,679 INFO L226 Difference]: Without dead ends: 722 [2018-11-07 05:08:31,679 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 201 SyntacticMatches, 24 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2569 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1275, Invalid=5531, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 05:08:31,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2018-11-07 05:08:31,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 154. [2018-11-07 05:08:31,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-11-07 05:08:31,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 166 transitions. [2018-11-07 05:08:31,945 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 166 transitions. Word has length 119 [2018-11-07 05:08:31,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:31,945 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 166 transitions. [2018-11-07 05:08:31,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-11-07 05:08:31,945 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 166 transitions. [2018-11-07 05:08:31,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 05:08:31,945 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:31,946 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:31,946 INFO L423 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:31,946 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:31,946 INFO L82 PathProgramCache]: Analyzing trace with hash -157154603, now seen corresponding path program 10 times [2018-11-07 05:08:31,946 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:31,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:31,947 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:08:31,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:31,947 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:31,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:32,412 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:32,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:32,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:32,412 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:32,412 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:32,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:32,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:32,421 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:08:32,421 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:08:32,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:32,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:32,796 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:32,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:33,026 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:33,045 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:33,045 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 40 [2018-11-07 05:08:33,046 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:33,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 05:08:33,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 05:08:33,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1215, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 05:08:33,046 INFO L87 Difference]: Start difference. First operand 154 states and 166 transitions. Second operand 40 states. [2018-11-07 05:08:36,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:36,226 INFO L93 Difference]: Finished difference Result 826 states and 982 transitions. [2018-11-07 05:08:36,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-11-07 05:08:36,226 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 119 [2018-11-07 05:08:36,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:36,229 INFO L225 Difference]: With dead ends: 826 [2018-11-07 05:08:36,229 INFO L226 Difference]: Without dead ends: 773 [2018-11-07 05:08:36,229 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 202 SyntacticMatches, 24 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1965 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1059, Invalid=4343, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 05:08:36,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2018-11-07 05:08:36,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 157. [2018-11-07 05:08:36,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-11-07 05:08:36,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 170 transitions. [2018-11-07 05:08:36,475 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 170 transitions. Word has length 119 [2018-11-07 05:08:36,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:36,476 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 170 transitions. [2018-11-07 05:08:36,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 05:08:36,476 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 170 transitions. [2018-11-07 05:08:36,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-11-07 05:08:36,476 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:36,477 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:36,477 INFO L423 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:36,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:36,477 INFO L82 PathProgramCache]: Analyzing trace with hash 777037143, now seen corresponding path program 20 times [2018-11-07 05:08:36,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:36,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:36,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:08:36,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:36,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:36,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:36,640 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-11-07 05:08:36,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:36,641 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:36,641 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:36,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:36,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:36,641 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:36,649 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:08:36,650 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:08:36,691 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 05:08:36,692 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:08:36,694 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:36,743 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:36,743 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:36,883 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 05:08:36,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:36,903 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2018-11-07 05:08:36,903 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:36,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 05:08:36,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 05:08:36,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-11-07 05:08:36,903 INFO L87 Difference]: Start difference. First operand 157 states and 170 transitions. Second operand 19 states. [2018-11-07 05:08:37,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:37,503 INFO L93 Difference]: Finished difference Result 167 states and 180 transitions. [2018-11-07 05:08:37,503 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 05:08:37,503 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 121 [2018-11-07 05:08:37,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:37,505 INFO L225 Difference]: With dead ends: 167 [2018-11-07 05:08:37,505 INFO L226 Difference]: Without dead ends: 165 [2018-11-07 05:08:37,505 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 230 SyntacticMatches, 23 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-11-07 05:08:37,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-11-07 05:08:37,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 165. [2018-11-07 05:08:37,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-11-07 05:08:37,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 178 transitions. [2018-11-07 05:08:37,762 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 178 transitions. Word has length 121 [2018-11-07 05:08:37,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:37,762 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 178 transitions. [2018-11-07 05:08:37,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 05:08:37,762 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 178 transitions. [2018-11-07 05:08:37,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:08:37,763 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:37,763 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:37,763 INFO L423 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:37,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:37,763 INFO L82 PathProgramCache]: Analyzing trace with hash -1277952389, now seen corresponding path program 21 times [2018-11-07 05:08:37,763 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:37,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:37,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:08:37,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:37,764 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:37,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:38,312 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:38,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:38,313 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:38,313 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:38,313 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:38,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:38,313 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:38,322 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:08:38,323 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:08:38,359 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:08:38,360 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:08:38,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:38,940 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:38,941 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:39,216 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:39,236 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:39,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 54 [2018-11-07 05:08:39,236 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:39,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-11-07 05:08:39,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-11-07 05:08:39,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=575, Invalid=2287, Unknown=0, NotChecked=0, Total=2862 [2018-11-07 05:08:39,237 INFO L87 Difference]: Start difference. First operand 165 states and 178 transitions. Second operand 54 states. [2018-11-07 05:08:41,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:41,298 INFO L93 Difference]: Finished difference Result 294 states and 332 transitions. [2018-11-07 05:08:41,299 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 05:08:41,299 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 129 [2018-11-07 05:08:41,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:41,300 INFO L225 Difference]: With dead ends: 294 [2018-11-07 05:08:41,300 INFO L226 Difference]: Without dead ends: 237 [2018-11-07 05:08:41,301 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 208 SyntacticMatches, 26 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2990 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1225, Invalid=5095, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 05:08:41,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-11-07 05:08:41,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 167. [2018-11-07 05:08:41,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:08:41,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:08:41,584 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:08:41,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:41,584 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:08:41,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-11-07 05:08:41,584 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:08:41,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:08:41,585 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:41,585 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:41,585 INFO L423 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:41,586 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:41,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1178325753, now seen corresponding path program 46 times [2018-11-07 05:08:41,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:41,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:41,586 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:08:41,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:41,587 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:41,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:41,932 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:41,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:41,933 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:41,933 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:41,933 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:41,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:41,933 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:41,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:08:41,942 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:08:41,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:41,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:42,572 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:42,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:42,837 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:42,858 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:42,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 53 [2018-11-07 05:08:42,859 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:42,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-11-07 05:08:42,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-11-07 05:08:42,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=539, Invalid=2217, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 05:08:42,860 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 53 states. [2018-11-07 05:08:45,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:45,248 INFO L93 Difference]: Finished difference Result 364 states and 415 transitions. [2018-11-07 05:08:45,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 05:08:45,249 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 129 [2018-11-07 05:08:45,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:45,250 INFO L225 Difference]: With dead ends: 364 [2018-11-07 05:08:45,250 INFO L226 Difference]: Without dead ends: 307 [2018-11-07 05:08:45,251 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 209 SyntacticMatches, 26 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3510 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1485, Invalid=6525, Unknown=0, NotChecked=0, Total=8010 [2018-11-07 05:08:45,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-11-07 05:08:45,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 167. [2018-11-07 05:08:45,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:08:45,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:08:45,547 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:08:45,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:45,547 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:08:45,547 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-11-07 05:08:45,548 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:08:45,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:08:45,548 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:45,548 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 10, 9, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:45,549 INFO L423 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:45,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:45,549 INFO L82 PathProgramCache]: Analyzing trace with hash -154759533, now seen corresponding path program 47 times [2018-11-07 05:08:45,549 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:45,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:45,550 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:08:45,550 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:45,550 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:45,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:45,965 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:45,965 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:45,965 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:45,965 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:45,965 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:45,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:45,966 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:45,973 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:08:45,973 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:08:46,016 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 05:08:46,017 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:08:46,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:46,676 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:46,676 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:46,939 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:46,958 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:46,959 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 52 [2018-11-07 05:08:46,959 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:46,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-07 05:08:46,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-07 05:08:46,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=2145, Unknown=0, NotChecked=0, Total=2652 [2018-11-07 05:08:46,960 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 52 states. [2018-11-07 05:08:49,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:49,867 INFO L93 Difference]: Finished difference Result 432 states and 496 transitions. [2018-11-07 05:08:49,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-07 05:08:49,868 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 129 [2018-11-07 05:08:49,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:49,869 INFO L225 Difference]: With dead ends: 432 [2018-11-07 05:08:49,869 INFO L226 Difference]: Without dead ends: 375 [2018-11-07 05:08:49,870 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 210 SyntacticMatches, 26 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3996 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1729, Invalid=7777, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 05:08:49,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2018-11-07 05:08:50,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 167. [2018-11-07 05:08:50,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:08:50,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:08:50,205 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:08:50,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:50,205 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:08:50,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-07 05:08:50,205 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:08:50,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:08:50,206 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:50,206 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 9, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:50,206 INFO L423 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:50,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:50,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1607197471, now seen corresponding path program 48 times [2018-11-07 05:08:50,206 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:50,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:50,207 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:08:50,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:50,207 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:50,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:50,526 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:50,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:50,526 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:50,526 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:50,526 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:50,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:50,527 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:50,535 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:08:50,535 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:08:50,569 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:08:50,569 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:08:50,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:51,359 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:51,359 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:51,720 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:51,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:51,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 51 [2018-11-07 05:08:51,740 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:51,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-07 05:08:51,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-07 05:08:51,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=2071, Unknown=0, NotChecked=0, Total=2550 [2018-11-07 05:08:51,741 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 51 states. [2018-11-07 05:08:55,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:08:55,097 INFO L93 Difference]: Finished difference Result 498 states and 575 transitions. [2018-11-07 05:08:55,097 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-11-07 05:08:55,098 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 129 [2018-11-07 05:08:55,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:08:55,099 INFO L225 Difference]: With dead ends: 498 [2018-11-07 05:08:55,099 INFO L226 Difference]: Without dead ends: 441 [2018-11-07 05:08:55,100 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 211 SyntacticMatches, 26 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4398 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1933, Invalid=8779, Unknown=0, NotChecked=0, Total=10712 [2018-11-07 05:08:55,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2018-11-07 05:08:55,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 167. [2018-11-07 05:08:55,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:08:55,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:08:55,435 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:08:55,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:08:55,436 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:08:55,436 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-07 05:08:55,436 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:08:55,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:08:55,436 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:08:55,437 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 8, 7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:08:55,437 INFO L423 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:08:55,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:08:55,437 INFO L82 PathProgramCache]: Analyzing trace with hash -285939029, now seen corresponding path program 49 times [2018-11-07 05:08:55,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:08:55,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:55,438 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:08:55,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:08:55,438 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:08:55,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:55,778 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:55,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:55,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:08:55,778 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:08:55,779 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:08:55,779 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:08:55,779 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:08:55,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:08:55,786 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:08:55,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:08:55,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:08:56,603 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:56,603 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:08:56,916 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:08:56,936 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:08:56,936 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 50 [2018-11-07 05:08:56,936 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:08:56,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-11-07 05:08:56,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-11-07 05:08:56,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=1995, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 05:08:56,938 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 50 states. [2018-11-07 05:09:00,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:09:00,508 INFO L93 Difference]: Finished difference Result 562 states and 652 transitions. [2018-11-07 05:09:00,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-11-07 05:09:00,509 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 129 [2018-11-07 05:09:00,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:09:00,511 INFO L225 Difference]: With dead ends: 562 [2018-11-07 05:09:00,511 INFO L226 Difference]: Without dead ends: 505 [2018-11-07 05:09:00,512 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 212 SyntacticMatches, 26 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4678 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2079, Invalid=9477, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 05:09:00,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2018-11-07 05:09:00,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 167. [2018-11-07 05:09:00,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:09:00,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:09:00,869 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:09:00,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:09:00,869 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:09:00,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-11-07 05:09:00,869 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:09:00,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:09:00,870 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:09:00,870 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:09:00,870 INFO L423 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:09:00,870 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:09:00,870 INFO L82 PathProgramCache]: Analyzing trace with hash 798123319, now seen corresponding path program 50 times [2018-11-07 05:09:00,870 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:09:00,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:00,871 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:09:00,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:00,871 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:09:00,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:09:01,238 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:01,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:01,238 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:09:01,238 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:09:01,238 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:09:01,238 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:01,239 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:09:01,251 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:09:01,251 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:09:01,293 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 05:09:01,293 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:09:01,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:09:01,930 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:01,930 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:09:02,177 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:02,197 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:09:02,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 49 [2018-11-07 05:09:02,198 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:09:02,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 05:09:02,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 05:09:02,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=1917, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 05:09:02,199 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 49 states. [2018-11-07 05:09:06,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:09:06,202 INFO L93 Difference]: Finished difference Result 624 states and 727 transitions. [2018-11-07 05:09:06,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-11-07 05:09:06,203 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 129 [2018-11-07 05:09:06,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:09:06,205 INFO L225 Difference]: With dead ends: 624 [2018-11-07 05:09:06,205 INFO L226 Difference]: Without dead ends: 567 [2018-11-07 05:09:06,206 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 213 SyntacticMatches, 26 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4810 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2155, Invalid=9835, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 05:09:06,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2018-11-07 05:09:06,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 167. [2018-11-07 05:09:06,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:09:06,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:09:06,545 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:09:06,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:09:06,546 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:09:06,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 05:09:06,546 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:09:06,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:09:06,546 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:09:06,546 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:09:06,546 INFO L423 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:09:06,547 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:09:06,547 INFO L82 PathProgramCache]: Analyzing trace with hash -903540029, now seen corresponding path program 51 times [2018-11-07 05:09:06,547 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:09:06,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:06,548 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:09:06,548 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:06,548 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:09:06,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:09:06,923 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:06,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:06,924 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:09:06,924 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:09:06,924 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:09:06,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:06,924 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:09:06,933 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:09:06,933 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:09:06,968 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:09:06,968 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:09:06,970 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:09:07,558 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:07,558 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:09:07,825 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 275 proven. 72 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:07,845 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:09:07,845 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 48 [2018-11-07 05:09:07,845 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:09:07,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-11-07 05:09:07,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-11-07 05:09:07,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1837, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 05:09:07,846 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 48 states. [2018-11-07 05:09:12,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:09:12,000 INFO L93 Difference]: Finished difference Result 684 states and 800 transitions. [2018-11-07 05:09:12,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-11-07 05:09:12,000 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 129 [2018-11-07 05:09:12,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:09:12,003 INFO L225 Difference]: With dead ends: 684 [2018-11-07 05:09:12,003 INFO L226 Difference]: Without dead ends: 627 [2018-11-07 05:09:12,004 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 214 SyntacticMatches, 26 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4780 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2155, Invalid=9835, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 05:09:12,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2018-11-07 05:09:12,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 167. [2018-11-07 05:09:12,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:09:12,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:09:12,518 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:09:12,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:09:12,518 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:09:12,518 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-11-07 05:09:12,518 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:09:12,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:09:12,519 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:09:12,519 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 8, 7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:09:12,519 INFO L423 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:09:12,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:09:12,519 INFO L82 PathProgramCache]: Analyzing trace with hash 274576207, now seen corresponding path program 52 times [2018-11-07 05:09:12,520 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:09:12,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:12,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:09:12,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:12,520 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:09:12,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:09:12,817 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:12,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:12,817 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:09:12,817 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:09:12,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:09:12,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:12,818 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:09:12,825 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:09:12,826 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:09:12,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:09:12,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:09:13,349 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:13,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:09:13,616 INFO L134 CoverageAnalysis]: Checked inductivity of 571 backedges. 275 proven. 76 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:13,635 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:09:13,635 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 47 [2018-11-07 05:09:13,635 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:09:13,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-11-07 05:09:13,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-11-07 05:09:13,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=1755, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 05:09:13,637 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 47 states. [2018-11-07 05:09:18,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:09:18,092 INFO L93 Difference]: Finished difference Result 742 states and 871 transitions. [2018-11-07 05:09:18,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-11-07 05:09:18,092 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 129 [2018-11-07 05:09:18,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:09:18,095 INFO L225 Difference]: With dead ends: 742 [2018-11-07 05:09:18,095 INFO L226 Difference]: Without dead ends: 685 [2018-11-07 05:09:18,096 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 215 SyntacticMatches, 26 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4582 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2079, Invalid=9477, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 05:09:18,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 685 states. [2018-11-07 05:09:18,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 685 to 167. [2018-11-07 05:09:18,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:09:18,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:09:18,430 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:09:18,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:09:18,430 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:09:18,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-11-07 05:09:18,431 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:09:18,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:09:18,431 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:09:18,432 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 9, 8, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:09:18,432 INFO L423 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:09:18,432 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:09:18,432 INFO L82 PathProgramCache]: Analyzing trace with hash -1994586405, now seen corresponding path program 53 times [2018-11-07 05:09:18,432 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:09:18,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:18,433 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:09:18,433 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:18,433 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:09:18,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:09:18,816 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:18,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:18,817 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:09:18,817 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:09:18,817 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:09:18,817 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:18,817 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:09:18,825 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:09:18,825 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:09:18,866 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 05:09:18,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:09:18,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:09:19,302 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:19,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:09:19,565 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 275 proven. 84 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:19,584 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:09:19,584 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 46 [2018-11-07 05:09:19,585 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:09:19,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 05:09:19,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 05:09:19,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=1671, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 05:09:19,586 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 46 states. [2018-11-07 05:09:24,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:09:24,253 INFO L93 Difference]: Finished difference Result 798 states and 940 transitions. [2018-11-07 05:09:24,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-11-07 05:09:24,253 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 129 [2018-11-07 05:09:24,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:09:24,256 INFO L225 Difference]: With dead ends: 798 [2018-11-07 05:09:24,256 INFO L226 Difference]: Without dead ends: 741 [2018-11-07 05:09:24,257 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 216 SyntacticMatches, 26 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4218 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1933, Invalid=8779, Unknown=0, NotChecked=0, Total=10712 [2018-11-07 05:09:24,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2018-11-07 05:09:24,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 167. [2018-11-07 05:09:24,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:09:24,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:09:24,611 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:09:24,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:09:24,611 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:09:24,611 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 05:09:24,611 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:09:24,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:09:24,611 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:09:24,612 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 10, 9, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:09:24,612 INFO L423 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:09:24,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:09:24,612 INFO L82 PathProgramCache]: Analyzing trace with hash 2087964007, now seen corresponding path program 54 times [2018-11-07 05:09:24,612 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:09:24,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:24,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:09:24,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:24,613 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:09:24,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:09:25,030 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:25,031 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:25,031 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:09:25,031 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:09:25,031 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:09:25,031 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:25,031 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:09:25,039 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:09:25,040 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:09:25,076 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:09:25,076 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:09:25,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:09:25,534 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:25,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:09:25,776 INFO L134 CoverageAnalysis]: Checked inductivity of 591 backedges. 275 proven. 96 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:25,796 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:09:25,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 45 [2018-11-07 05:09:25,797 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:09:25,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 05:09:25,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 05:09:25,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1585, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 05:09:25,798 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 45 states. [2018-11-07 05:09:30,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:09:30,318 INFO L93 Difference]: Finished difference Result 852 states and 1007 transitions. [2018-11-07 05:09:30,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-11-07 05:09:30,319 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 129 [2018-11-07 05:09:30,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:09:30,323 INFO L225 Difference]: With dead ends: 852 [2018-11-07 05:09:30,323 INFO L226 Difference]: Without dead ends: 795 [2018-11-07 05:09:30,324 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 217 SyntacticMatches, 26 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3702 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1729, Invalid=7777, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 05:09:30,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2018-11-07 05:09:30,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 167. [2018-11-07 05:09:30,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-11-07 05:09:30,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 180 transitions. [2018-11-07 05:09:30,783 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 180 transitions. Word has length 129 [2018-11-07 05:09:30,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:09:30,783 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 180 transitions. [2018-11-07 05:09:30,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 05:09:30,783 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 180 transitions. [2018-11-07 05:09:30,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-11-07 05:09:30,784 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:09:30,784 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:09:30,784 INFO L423 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:09:30,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:09:30,784 INFO L82 PathProgramCache]: Analyzing trace with hash 2141374195, now seen corresponding path program 55 times [2018-11-07 05:09:30,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:09:30,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:30,785 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:09:30,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:09:30,785 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:09:30,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:09:31,116 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:31,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:31,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:09:31,117 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:09:31,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:09:31,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:09:31,117 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:09:31,126 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:09:31,127 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:09:31,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:09:31,162 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:09:31,562 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:31,562 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:09:31,828 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 275 proven. 112 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-11-07 05:09:31,848 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:09:31,848 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2018-11-07 05:09:31,848 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:09:31,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 05:09:31,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 05:09:31,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1497, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 05:09:31,849 INFO L87 Difference]: Start difference. First operand 167 states and 180 transitions. Second operand 44 states. Received shutdown request... [2018-11-07 05:09:35,435 WARN L187 SmtUtils]: Removed 2 from assertion stack [2018-11-07 05:09:35,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 05:09:35,436 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 05:09:35,440 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 05:09:35,441 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 05:09:35 BoogieIcfgContainer [2018-11-07 05:09:35,441 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 05:09:35,442 INFO L168 Benchmark]: Toolchain (without parser) took 236267.77 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 648.0 MB). Free memory was 1.4 GB in the beginning and 1.7 GB in the end (delta: -295.8 MB). Peak memory consumption was 352.2 MB. Max. memory is 7.1 GB. [2018-11-07 05:09:35,443 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 05:09:35,443 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.64 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-07 05:09:35,444 INFO L168 Benchmark]: Boogie Procedure Inliner took 19.98 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 05:09:35,444 INFO L168 Benchmark]: Boogie Preprocessor took 21.81 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 05:09:35,444 INFO L168 Benchmark]: RCFGBuilder took 517.14 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 753.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -794.0 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. [2018-11-07 05:09:35,445 INFO L168 Benchmark]: TraceAbstraction took 235400.10 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -105.4 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 487.6 MB). Peak memory consumption was 382.2 MB. Max. memory is 7.1 GB. [2018-11-07 05:09:35,447 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 304.64 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 19.98 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 21.81 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 517.14 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 753.4 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -794.0 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 235400.10 ms. Allocated memory was 2.3 GB in the beginning and 2.2 GB in the end (delta: -105.4 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 487.6 MB). Peak memory consumption was 382.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (167states) and FLOYD_HOARE automaton (currently 49 states, 44 states before enhancement),while PredicateUnifier was unifying predicates,while SimplifyDDAWithTimeout was simplifying term of DAG size 14. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. TIMEOUT Result, 235.3s OverallTime, 89 OverallIterations, 12 TraceHistogramMax, 132.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 4241 SDtfs, 11573 SDslu, 35584 SDs, 0 SdLazy, 32388 SolverSat, 7608 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 32.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19843 GetRequests, 13134 SyntacticMatches, 1566 SemanticMatches, 5142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152011 ImplicationChecksByTransitivity, 116.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=167occurred in iteration=79, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.6s AbstIntTime, 3 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 11.3s AutomataMinimizationTime, 88 MinimizatonAttempts, 16662 StatesRemovedByMinimization, 77 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.4s SsaConstructionTime, 2.7s SatisfiabilityAnalysisTime, 82.9s InterpolantComputationTime, 15685 NumberOfCodeBlocks, 15685 NumberOfCodeBlocksAsserted, 406 NumberOfCheckSat, 23238 ConstructedInterpolants, 0 QuantifiedInterpolants, 9284136 SizeOfPredicates, 552 NumberOfNonLiveVariables, 16866 ConjunctsInSsa, 1768 ConjunctsInUnsatCore, 261 InterpolantComputations, 3 PerfectInterpolantSequences, 62452/76688 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown