java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-b6335f6 [2018-10-23 09:55:30,300 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-23 09:55:30,304 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-23 09:55:30,325 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-23 09:55:30,325 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-23 09:55:30,326 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-23 09:55:30,328 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-23 09:55:30,331 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-23 09:55:30,334 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-23 09:55:30,336 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-23 09:55:30,339 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-23 09:55:30,339 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-23 09:55:30,340 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-23 09:55:30,341 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-23 09:55:30,344 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-23 09:55:30,345 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-23 09:55:30,346 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-23 09:55:30,349 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-23 09:55:30,351 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-23 09:55:30,353 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-23 09:55:30,354 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-23 09:55:30,355 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-23 09:55:30,358 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-23 09:55:30,366 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-23 09:55:30,381 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-23 09:55:30,382 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-23 09:55:30,382 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-23 09:55:30,383 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-23 09:55:30,383 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-23 09:55:30,383 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-23 09:55:30,383 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-23 09:55:30,383 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-23 09:55:30,384 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-23 09:55:30,384 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-23 09:55:30,384 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-23 09:55:30,384 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-23 09:55:30,385 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-23 09:55:30,385 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-23 09:55:30,385 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-23 09:55:30,385 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-23 09:55:30,386 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-23 09:55:30,386 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-23 09:55:30,386 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-23 09:55:30,386 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-23 09:55:30,386 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-23 09:55:30,387 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-23 09:55:30,387 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-23 09:55:30,387 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-23 09:55:30,387 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 09:55:30,387 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-23 09:55:30,388 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-23 09:55:30,388 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-23 09:55:30,388 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-23 09:55:30,388 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-23 09:55:30,388 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-23 09:55:30,388 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-23 09:55:30,389 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-23 09:55:30,389 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-23 09:55:30,445 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-23 09:55:30,458 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-23 09:55:30,462 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-23 09:55:30,465 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-23 09:55:30,465 INFO L276 PluginConnector]: CDTParser initialized [2018-10-23 09:55:30,466 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call1_true-termination.i [2018-10-23 09:55:30,532 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e71d67c1d/59b2d7bb50804faeb4da4e0512aeddd7/FLAG50858ea26 [2018-10-23 09:55:31,036 INFO L298 CDTParser]: Found 1 translation units. [2018-10-23 09:55:31,037 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_false-unreach-call1_true-termination.i [2018-10-23 09:55:31,045 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e71d67c1d/59b2d7bb50804faeb4da4e0512aeddd7/FLAG50858ea26 [2018-10-23 09:55:31,059 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e71d67c1d/59b2d7bb50804faeb4da4e0512aeddd7 [2018-10-23 09:55:31,071 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-23 09:55:31,073 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-23 09:55:31,074 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-23 09:55:31,074 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-23 09:55:31,078 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-23 09:55:31,079 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,083 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@757020ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31, skipping insertion in model container [2018-10-23 09:55:31,083 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,094 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-23 09:55:31,115 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-23 09:55:31,347 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 09:55:31,352 INFO L189 MainTranslator]: Completed pre-run [2018-10-23 09:55:31,375 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 09:55:31,398 INFO L193 MainTranslator]: Completed translation [2018-10-23 09:55:31,398 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31 WrapperNode [2018-10-23 09:55:31,398 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-23 09:55:31,399 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-23 09:55:31,400 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-23 09:55:31,400 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-23 09:55:31,409 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,418 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,436 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-23 09:55:31,437 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-23 09:55:31,437 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-23 09:55:31,437 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-23 09:55:31,447 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,447 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,448 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,449 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,453 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,457 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,459 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... [2018-10-23 09:55:31,461 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-23 09:55:31,462 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-23 09:55:31,462 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-23 09:55:31,462 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-23 09:55:31,463 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 09:55:31,601 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-23 09:55:31,601 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-23 09:55:31,602 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-23 09:55:31,602 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-23 09:55:31,602 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-23 09:55:31,602 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-23 09:55:31,602 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-23 09:55:31,602 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-23 09:55:31,953 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-23 09:55:31,954 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:55:31 BoogieIcfgContainer [2018-10-23 09:55:31,954 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-23 09:55:31,955 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-23 09:55:31,955 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-23 09:55:31,964 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-23 09:55:31,964 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 09:55:31" (1/3) ... [2018-10-23 09:55:31,965 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@210cfd7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:55:31, skipping insertion in model container [2018-10-23 09:55:31,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 09:55:31" (2/3) ... [2018-10-23 09:55:31,965 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@210cfd7f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 09:55:31, skipping insertion in model container [2018-10-23 09:55:31,966 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 09:55:31" (3/3) ... [2018-10-23 09:55:31,967 INFO L112 eAbstractionObserver]: Analyzing ICFG array_false-unreach-call1_true-termination.i [2018-10-23 09:55:31,975 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-23 09:55:31,983 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-23 09:55:31,997 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-23 09:55:32,028 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-23 09:55:32,028 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-23 09:55:32,028 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-23 09:55:32,029 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-23 09:55:32,029 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-23 09:55:32,029 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-23 09:55:32,029 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-23 09:55:32,029 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-23 09:55:32,049 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-23 09:55:32,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-23 09:55:32,056 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:32,057 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:32,060 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:32,066 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:32,067 INFO L82 PathProgramCache]: Analyzing trace with hash -173834890, now seen corresponding path program 1 times [2018-10-23 09:55:32,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:32,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:32,129 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:32,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:32,130 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:32,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:32,215 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:32,217 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 09:55:32,217 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-23 09:55:32,217 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 09:55:32,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-23 09:55:32,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-23 09:55:32,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 09:55:32,239 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-23 09:55:32,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:32,265 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2018-10-23 09:55:32,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-23 09:55:32,266 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2018-10-23 09:55:32,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:32,275 INFO L225 Difference]: With dead ends: 35 [2018-10-23 09:55:32,276 INFO L226 Difference]: Without dead ends: 15 [2018-10-23 09:55:32,280 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 09:55:32,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-23 09:55:32,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-23 09:55:32,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-23 09:55:32,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-23 09:55:32,321 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-23 09:55:32,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:32,322 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-23 09:55:32,322 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-23 09:55:32,322 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-23 09:55:32,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-23 09:55:32,323 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:32,323 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:32,324 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:32,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:32,324 INFO L82 PathProgramCache]: Analyzing trace with hash -737648989, now seen corresponding path program 1 times [2018-10-23 09:55:32,324 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:32,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:32,326 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:32,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:32,326 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:32,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:32,419 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:32,419 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 09:55:32,420 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-23 09:55:32,420 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 09:55:32,421 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-23 09:55:32,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-23 09:55:32,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 09:55:32,423 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 3 states. [2018-10-23 09:55:32,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:32,468 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-10-23 09:55:32,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 09:55:32,469 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-10-23 09:55:32,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:32,470 INFO L225 Difference]: With dead ends: 24 [2018-10-23 09:55:32,470 INFO L226 Difference]: Without dead ends: 18 [2018-10-23 09:55:32,471 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-23 09:55:32,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-23 09:55:32,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-23 09:55:32,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-23 09:55:32,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-23 09:55:32,476 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2018-10-23 09:55:32,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:32,478 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-23 09:55:32,478 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-23 09:55:32,478 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-23 09:55:32,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-23 09:55:32,479 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:32,479 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:32,480 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:32,480 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:32,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1154592614, now seen corresponding path program 1 times [2018-10-23 09:55:32,480 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:32,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:32,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:32,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:32,483 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:32,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:32,589 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:32,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:32,589 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:32,590 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-10-23 09:55:32,592 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [35], [36], [37], [39] [2018-10-23 09:55:32,645 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 09:55:32,645 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 09:55:33,221 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-23 09:55:33,222 INFO L272 AbstractInterpreter]: Visited 15 different actions 50 times. Merged at 3 different actions 26 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 29 variables. [2018-10-23 09:55:33,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:33,257 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-23 09:55:33,257 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:33,257 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:33,275 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:33,275 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:55:33,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:33,316 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:33,375 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:33,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:33,500 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:33,523 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:33,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-23 09:55:33,523 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:33,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-23 09:55:33,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-23 09:55:33,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-23 09:55:33,525 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 5 states. [2018-10-23 09:55:33,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:33,630 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-23 09:55:33,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-23 09:55:33,633 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2018-10-23 09:55:33,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:33,634 INFO L225 Difference]: With dead ends: 27 [2018-10-23 09:55:33,634 INFO L226 Difference]: Without dead ends: 21 [2018-10-23 09:55:33,635 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-23 09:55:33,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-23 09:55:33,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2018-10-23 09:55:33,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-23 09:55:33,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-23 09:55:33,641 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2018-10-23 09:55:33,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:33,641 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-23 09:55:33,641 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-23 09:55:33,642 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-23 09:55:33,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-23 09:55:33,642 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:33,643 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:33,643 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:33,643 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:33,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1276704957, now seen corresponding path program 2 times [2018-10-23 09:55:33,644 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:33,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:33,645 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:33,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:33,645 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:33,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:33,791 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:33,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:33,792 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:33,792 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:33,793 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:33,793 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:33,793 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:33,811 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:55:33,811 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:55:33,848 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:55:33,849 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:33,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:33,866 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:33,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:34,161 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:34,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:34,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-23 09:55:34,183 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:34,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-23 09:55:34,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-23 09:55:34,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-23 09:55:34,185 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 6 states. [2018-10-23 09:55:34,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:34,240 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-23 09:55:34,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-23 09:55:34,242 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-23 09:55:34,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:34,243 INFO L225 Difference]: With dead ends: 30 [2018-10-23 09:55:34,243 INFO L226 Difference]: Without dead ends: 24 [2018-10-23 09:55:34,244 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-23 09:55:34,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-23 09:55:34,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2018-10-23 09:55:34,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-23 09:55:34,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-23 09:55:34,249 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2018-10-23 09:55:34,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:34,250 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-23 09:55:34,250 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-23 09:55:34,250 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-23 09:55:34,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-23 09:55:34,251 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:34,251 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:34,251 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:34,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:34,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1288215558, now seen corresponding path program 3 times [2018-10-23 09:55:34,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:34,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:34,253 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:34,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:34,254 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:34,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:34,356 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:34,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:34,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:34,357 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:34,357 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:34,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:34,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:34,365 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:55:34,366 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:55:34,429 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:55:34,429 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:34,433 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:34,499 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:34,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:34,583 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:34,611 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:34,611 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-10-23 09:55:34,611 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:34,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 09:55:34,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 09:55:34,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-23 09:55:34,615 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 7 states. [2018-10-23 09:55:34,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:34,666 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-23 09:55:34,667 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 09:55:34,667 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2018-10-23 09:55:34,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:34,669 INFO L225 Difference]: With dead ends: 33 [2018-10-23 09:55:34,669 INFO L226 Difference]: Without dead ends: 27 [2018-10-23 09:55:34,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-23 09:55:34,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-23 09:55:34,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-10-23 09:55:34,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-23 09:55:34,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-23 09:55:34,675 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2018-10-23 09:55:34,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:34,675 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-23 09:55:34,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 09:55:34,675 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-23 09:55:34,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-23 09:55:34,676 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:34,676 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:34,677 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:34,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:34,677 INFO L82 PathProgramCache]: Analyzing trace with hash -603146269, now seen corresponding path program 4 times [2018-10-23 09:55:34,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:34,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:34,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:34,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:34,679 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:34,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:34,805 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:34,806 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:34,806 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:34,806 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:34,806 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:34,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:34,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:34,822 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:34,822 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:55:34,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:34,875 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:34,894 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:34,894 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:35,343 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:35,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:35,369 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-23 09:55:35,369 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:35,369 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-23 09:55:35,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-23 09:55:35,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-23 09:55:35,370 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 8 states. [2018-10-23 09:55:35,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:35,434 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-23 09:55:35,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-23 09:55:35,437 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-10-23 09:55:35,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:35,438 INFO L225 Difference]: With dead ends: 36 [2018-10-23 09:55:35,438 INFO L226 Difference]: Without dead ends: 30 [2018-10-23 09:55:35,439 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-23 09:55:35,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-23 09:55:35,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-23 09:55:35,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-23 09:55:35,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-23 09:55:35,444 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2018-10-23 09:55:35,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:35,445 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-23 09:55:35,445 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-23 09:55:35,445 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-23 09:55:35,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-23 09:55:35,446 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:35,446 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:35,446 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:35,447 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:35,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1388548262, now seen corresponding path program 5 times [2018-10-23 09:55:35,447 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:35,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:35,448 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:35,448 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:35,448 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:35,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:35,637 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:35,637 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:35,637 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:35,638 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:35,638 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:35,638 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:35,638 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:35,655 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:55:35,655 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:55:35,697 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:55:35,697 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:35,700 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:35,717 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:35,718 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:35,906 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:35,928 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:35,928 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-23 09:55:35,929 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:35,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 09:55:35,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 09:55:35,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-23 09:55:35,930 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 9 states. [2018-10-23 09:55:36,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:36,026 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-23 09:55:36,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 09:55:36,027 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2018-10-23 09:55:36,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:36,028 INFO L225 Difference]: With dead ends: 39 [2018-10-23 09:55:36,028 INFO L226 Difference]: Without dead ends: 33 [2018-10-23 09:55:36,029 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-23 09:55:36,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-23 09:55:36,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-10-23 09:55:36,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-23 09:55:36,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-23 09:55:36,034 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2018-10-23 09:55:36,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:36,034 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-23 09:55:36,034 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 09:55:36,034 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-23 09:55:36,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-23 09:55:36,035 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:36,035 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:36,036 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:36,036 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:36,036 INFO L82 PathProgramCache]: Analyzing trace with hash -317493117, now seen corresponding path program 6 times [2018-10-23 09:55:36,036 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:36,037 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:36,037 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:36,038 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:36,038 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:36,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:36,198 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:36,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:36,198 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:36,199 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:36,199 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:36,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:36,199 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:36,207 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:55:36,208 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:55:36,262 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:55:36,262 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:36,267 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:36,382 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:36,382 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:36,568 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:36,591 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:36,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2018-10-23 09:55:36,591 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:36,592 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-23 09:55:36,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-23 09:55:36,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-23 09:55:36,593 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 10 states. [2018-10-23 09:55:36,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:36,650 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-23 09:55:36,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-23 09:55:36,652 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-10-23 09:55:36,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:36,654 INFO L225 Difference]: With dead ends: 42 [2018-10-23 09:55:36,654 INFO L226 Difference]: Without dead ends: 36 [2018-10-23 09:55:36,654 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-23 09:55:36,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-23 09:55:36,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2018-10-23 09:55:36,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-23 09:55:36,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-23 09:55:36,660 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2018-10-23 09:55:36,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:36,661 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-23 09:55:36,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-23 09:55:36,661 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-23 09:55:36,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-23 09:55:36,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:36,662 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:36,662 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:36,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:36,663 INFO L82 PathProgramCache]: Analyzing trace with hash 174289594, now seen corresponding path program 7 times [2018-10-23 09:55:36,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:36,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:36,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:36,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:36,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:36,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:36,813 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:36,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:36,814 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:36,814 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:36,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:36,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:36,815 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:36,822 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:36,823 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:55:36,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:36,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:36,882 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:36,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:37,082 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:37,103 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:37,103 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-23 09:55:37,104 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:37,104 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-23 09:55:37,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-23 09:55:37,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-23 09:55:37,105 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 11 states. [2018-10-23 09:55:37,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:37,160 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-23 09:55:37,162 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 09:55:37,162 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2018-10-23 09:55:37,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:37,163 INFO L225 Difference]: With dead ends: 45 [2018-10-23 09:55:37,163 INFO L226 Difference]: Without dead ends: 39 [2018-10-23 09:55:37,164 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-23 09:55:37,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-23 09:55:37,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-23 09:55:37,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-23 09:55:37,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-23 09:55:37,169 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2018-10-23 09:55:37,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:37,169 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-23 09:55:37,170 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-23 09:55:37,170 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-23 09:55:37,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-23 09:55:37,171 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:37,171 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:37,171 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:37,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:37,171 INFO L82 PathProgramCache]: Analyzing trace with hash 739586339, now seen corresponding path program 8 times [2018-10-23 09:55:37,171 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:37,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:37,172 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:37,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:37,173 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:37,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:37,801 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:37,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:37,802 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:37,802 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:37,802 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:37,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:37,803 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:37,814 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:55:37,814 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:55:37,850 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:55:37,850 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:37,853 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:37,878 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:37,878 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:38,036 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:38,057 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:38,057 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-23 09:55:38,057 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:38,058 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-23 09:55:38,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-23 09:55:38,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-23 09:55:38,059 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 12 states. [2018-10-23 09:55:38,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:38,202 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-23 09:55:38,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-23 09:55:38,206 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2018-10-23 09:55:38,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:38,207 INFO L225 Difference]: With dead ends: 48 [2018-10-23 09:55:38,207 INFO L226 Difference]: Without dead ends: 42 [2018-10-23 09:55:38,208 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-23 09:55:38,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-23 09:55:38,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-23 09:55:38,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-23 09:55:38,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-23 09:55:38,213 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2018-10-23 09:55:38,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:38,214 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-23 09:55:38,214 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-23 09:55:38,214 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-23 09:55:38,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-23 09:55:38,215 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:38,215 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:38,216 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:38,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:38,216 INFO L82 PathProgramCache]: Analyzing trace with hash 928149018, now seen corresponding path program 9 times [2018-10-23 09:55:38,216 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:38,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:38,217 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:38,217 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:38,217 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:38,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:38,452 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:38,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:38,452 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:38,453 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:38,453 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:38,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:38,453 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:38,462 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:55:38,462 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:55:38,507 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:55:38,507 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:38,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:38,547 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:38,547 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:38,840 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:38,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:38,863 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2018-10-23 09:55:38,863 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:38,864 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-23 09:55:38,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-23 09:55:38,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-23 09:55:38,865 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 13 states. [2018-10-23 09:55:38,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:38,935 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-23 09:55:38,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-23 09:55:38,939 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2018-10-23 09:55:38,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:38,940 INFO L225 Difference]: With dead ends: 51 [2018-10-23 09:55:38,940 INFO L226 Difference]: Without dead ends: 45 [2018-10-23 09:55:38,941 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-23 09:55:38,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-23 09:55:38,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2018-10-23 09:55:38,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-23 09:55:38,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-23 09:55:38,947 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2018-10-23 09:55:38,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:38,947 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-23 09:55:38,948 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-23 09:55:38,948 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-23 09:55:38,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-23 09:55:38,949 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:38,949 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:38,949 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:38,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:38,950 INFO L82 PathProgramCache]: Analyzing trace with hash 581695939, now seen corresponding path program 10 times [2018-10-23 09:55:38,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:38,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:38,951 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:38,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:38,952 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:38,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:39,148 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:39,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:39,149 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:39,149 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:39,150 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:39,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:39,150 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:39,161 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:39,161 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:55:39,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:39,214 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:39,266 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:39,266 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:39,749 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:39,773 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:39,773 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-23 09:55:39,773 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:39,774 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-23 09:55:39,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-23 09:55:39,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-23 09:55:39,775 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 14 states. [2018-10-23 09:55:39,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:39,833 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-23 09:55:39,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-23 09:55:39,836 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 43 [2018-10-23 09:55:39,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:39,837 INFO L225 Difference]: With dead ends: 54 [2018-10-23 09:55:39,837 INFO L226 Difference]: Without dead ends: 48 [2018-10-23 09:55:39,838 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-23 09:55:39,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-23 09:55:39,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2018-10-23 09:55:39,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-23 09:55:39,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-10-23 09:55:39,843 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2018-10-23 09:55:39,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:39,843 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-10-23 09:55:39,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-23 09:55:39,843 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-10-23 09:55:39,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-23 09:55:39,844 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:39,844 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:39,845 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:39,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:39,845 INFO L82 PathProgramCache]: Analyzing trace with hash 204431738, now seen corresponding path program 11 times [2018-10-23 09:55:39,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:39,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:39,846 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:39,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:39,846 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:39,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:40,367 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:40,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:40,367 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:40,367 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:40,367 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:40,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:40,368 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:40,377 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:55:40,377 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:55:40,433 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:55:40,433 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:40,436 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:40,460 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:40,460 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:40,724 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:40,745 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:40,745 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-23 09:55:40,745 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:40,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-23 09:55:40,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-23 09:55:40,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-23 09:55:40,747 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 15 states. [2018-10-23 09:55:40,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:40,847 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-23 09:55:40,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-23 09:55:40,847 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 46 [2018-10-23 09:55:40,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:40,848 INFO L225 Difference]: With dead ends: 57 [2018-10-23 09:55:40,849 INFO L226 Difference]: Without dead ends: 51 [2018-10-23 09:55:40,850 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-23 09:55:40,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-23 09:55:40,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2018-10-23 09:55:40,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-23 09:55:40,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-23 09:55:40,855 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 46 [2018-10-23 09:55:40,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:40,855 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-23 09:55:40,855 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-23 09:55:40,856 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-23 09:55:40,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-23 09:55:40,856 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:40,856 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:40,857 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:40,857 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:40,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1056033379, now seen corresponding path program 12 times [2018-10-23 09:55:40,857 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:40,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:40,858 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:40,858 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:40,858 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:40,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:41,013 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:41,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:41,013 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:41,013 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:41,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:41,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:41,014 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:41,022 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:55:41,023 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:55:41,084 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:55:41,084 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:41,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:41,198 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:41,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:41,539 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:41,561 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:41,561 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2018-10-23 09:55:41,561 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:41,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-23 09:55:41,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-23 09:55:41,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-23 09:55:41,563 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 16 states. [2018-10-23 09:55:41,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:41,692 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-23 09:55:41,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-23 09:55:41,693 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 49 [2018-10-23 09:55:41,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:41,694 INFO L225 Difference]: With dead ends: 60 [2018-10-23 09:55:41,694 INFO L226 Difference]: Without dead ends: 54 [2018-10-23 09:55:41,695 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-23 09:55:41,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-23 09:55:41,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-23 09:55:41,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-23 09:55:41,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-10-23 09:55:41,701 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 49 [2018-10-23 09:55:41,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:41,706 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-10-23 09:55:41,706 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-23 09:55:41,706 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-10-23 09:55:41,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-10-23 09:55:41,707 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:41,707 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:41,708 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:41,708 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:41,708 INFO L82 PathProgramCache]: Analyzing trace with hash 748702938, now seen corresponding path program 13 times [2018-10-23 09:55:41,708 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:41,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:41,709 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:41,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:41,709 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:41,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:41,957 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:41,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:41,957 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:41,957 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:41,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:41,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:41,958 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:41,966 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:41,966 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:55:42,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:42,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:42,059 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:42,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:42,514 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:42,535 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:42,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-23 09:55:42,535 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:42,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-23 09:55:42,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-23 09:55:42,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-23 09:55:42,537 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 17 states. [2018-10-23 09:55:42,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:42,628 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-23 09:55:42,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-23 09:55:42,629 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 52 [2018-10-23 09:55:42,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:42,630 INFO L225 Difference]: With dead ends: 63 [2018-10-23 09:55:42,630 INFO L226 Difference]: Without dead ends: 57 [2018-10-23 09:55:42,632 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-23 09:55:42,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-23 09:55:42,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-10-23 09:55:42,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-23 09:55:42,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-23 09:55:42,637 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 52 [2018-10-23 09:55:42,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:42,638 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-23 09:55:42,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-23 09:55:42,638 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-23 09:55:42,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-23 09:55:42,639 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:42,639 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:42,639 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:42,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:42,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1937810179, now seen corresponding path program 14 times [2018-10-23 09:55:42,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:42,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:42,641 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:42,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:42,641 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:42,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:43,492 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:43,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:43,492 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:43,492 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:43,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:43,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:43,493 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:43,500 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:55:43,500 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:55:43,547 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:55:43,547 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:43,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:43,567 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:43,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:44,069 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:44,090 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:44,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-23 09:55:44,090 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:44,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-23 09:55:44,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-23 09:55:44,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-23 09:55:44,092 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 18 states. [2018-10-23 09:55:44,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:44,165 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-23 09:55:44,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-23 09:55:44,165 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 55 [2018-10-23 09:55:44,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:44,166 INFO L225 Difference]: With dead ends: 66 [2018-10-23 09:55:44,166 INFO L226 Difference]: Without dead ends: 60 [2018-10-23 09:55:44,167 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-23 09:55:44,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-23 09:55:44,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2018-10-23 09:55:44,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-23 09:55:44,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-10-23 09:55:44,172 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 55 [2018-10-23 09:55:44,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:44,173 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-10-23 09:55:44,173 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-23 09:55:44,173 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-10-23 09:55:44,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-23 09:55:44,174 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:44,174 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:44,174 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:44,174 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:44,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1741369402, now seen corresponding path program 15 times [2018-10-23 09:55:44,175 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:44,175 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:44,176 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:44,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:44,176 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:44,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:44,487 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:44,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:44,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:44,488 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:44,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:44,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:44,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:44,495 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:55:44,496 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:55:44,537 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:55:44,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:44,540 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:44,566 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:44,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:45,515 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:45,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:45,537 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2018-10-23 09:55:45,537 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:45,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-23 09:55:45,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-23 09:55:45,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-23 09:55:45,538 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 19 states. [2018-10-23 09:55:45,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:45,694 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-23 09:55:45,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-23 09:55:45,697 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 58 [2018-10-23 09:55:45,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:45,698 INFO L225 Difference]: With dead ends: 69 [2018-10-23 09:55:45,698 INFO L226 Difference]: Without dead ends: 63 [2018-10-23 09:55:45,699 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-23 09:55:45,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-10-23 09:55:45,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2018-10-23 09:55:45,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-23 09:55:45,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-23 09:55:45,704 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 58 [2018-10-23 09:55:45,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:45,704 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-23 09:55:45,705 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-23 09:55:45,705 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-23 09:55:45,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-23 09:55:45,706 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:45,706 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:45,706 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:45,706 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:45,707 INFO L82 PathProgramCache]: Analyzing trace with hash -680361053, now seen corresponding path program 16 times [2018-10-23 09:55:45,707 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:45,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:45,708 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:45,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:45,708 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:45,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:46,223 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:46,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:46,224 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:46,224 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:46,224 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:46,224 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:46,224 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:46,232 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:46,232 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:55:46,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:46,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:46,304 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:46,305 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:47,322 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:47,349 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:47,350 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-23 09:55:47,350 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:47,350 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-23 09:55:47,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-23 09:55:47,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-23 09:55:47,351 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 20 states. [2018-10-23 09:55:47,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:47,488 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-23 09:55:47,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-23 09:55:47,488 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 61 [2018-10-23 09:55:47,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:47,489 INFO L225 Difference]: With dead ends: 72 [2018-10-23 09:55:47,489 INFO L226 Difference]: Without dead ends: 66 [2018-10-23 09:55:47,490 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-23 09:55:47,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-23 09:55:47,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-23 09:55:47,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-23 09:55:47,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2018-10-23 09:55:47,496 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 61 [2018-10-23 09:55:47,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:47,496 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2018-10-23 09:55:47,496 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-23 09:55:47,496 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2018-10-23 09:55:47,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-23 09:55:47,497 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:47,497 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:47,498 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:47,498 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:47,498 INFO L82 PathProgramCache]: Analyzing trace with hash 408292250, now seen corresponding path program 17 times [2018-10-23 09:55:47,498 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:47,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:47,499 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:47,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:47,499 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:47,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:47,852 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:47,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:47,853 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:47,853 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:47,853 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:47,853 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:47,853 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:47,863 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:55:47,863 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:55:47,908 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:55:47,908 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:47,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:47,933 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:47,933 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:48,331 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:48,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:48,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-23 09:55:48,352 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:48,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-23 09:55:48,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-23 09:55:48,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-23 09:55:48,353 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 21 states. [2018-10-23 09:55:48,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:48,499 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-23 09:55:48,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-23 09:55:48,499 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 64 [2018-10-23 09:55:48,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:48,500 INFO L225 Difference]: With dead ends: 75 [2018-10-23 09:55:48,501 INFO L226 Difference]: Without dead ends: 69 [2018-10-23 09:55:48,502 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-23 09:55:48,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-23 09:55:48,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-10-23 09:55:48,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-23 09:55:48,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-23 09:55:48,507 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 64 [2018-10-23 09:55:48,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:48,507 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-23 09:55:48,507 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-23 09:55:48,507 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-23 09:55:48,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-23 09:55:48,508 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:48,508 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:48,508 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:48,509 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:48,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1180789827, now seen corresponding path program 18 times [2018-10-23 09:55:48,509 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:48,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:48,510 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:48,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:48,510 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:48,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:48,865 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:48,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:48,866 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:48,866 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:48,866 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:48,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:48,866 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:48,874 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:55:48,874 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:55:48,931 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:55:48,931 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:48,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:48,957 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:48,957 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:49,388 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:49,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:49,409 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 41 [2018-10-23 09:55:49,409 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:49,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-23 09:55:49,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-23 09:55:49,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-23 09:55:49,411 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 22 states. [2018-10-23 09:55:49,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:49,519 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-23 09:55:49,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-23 09:55:49,519 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2018-10-23 09:55:49,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:49,521 INFO L225 Difference]: With dead ends: 78 [2018-10-23 09:55:49,521 INFO L226 Difference]: Without dead ends: 72 [2018-10-23 09:55:49,522 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-23 09:55:49,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-23 09:55:49,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2018-10-23 09:55:49,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-10-23 09:55:49,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2018-10-23 09:55:49,527 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 67 [2018-10-23 09:55:49,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:49,527 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2018-10-23 09:55:49,528 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-23 09:55:49,528 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2018-10-23 09:55:49,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-10-23 09:55:49,528 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:49,529 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:49,529 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:49,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:49,529 INFO L82 PathProgramCache]: Analyzing trace with hash -2073633030, now seen corresponding path program 19 times [2018-10-23 09:55:49,530 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:49,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:49,531 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:49,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:49,531 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:49,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:49,839 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:49,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:49,840 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:49,840 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:49,840 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:49,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:49,840 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:49,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:49,848 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:55:49,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:49,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:49,952 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:49,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:50,600 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:50,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:50,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-23 09:55:50,621 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:50,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-23 09:55:50,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-23 09:55:50,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-23 09:55:50,623 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 23 states. [2018-10-23 09:55:50,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:50,735 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-23 09:55:50,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-23 09:55:50,736 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 70 [2018-10-23 09:55:50,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:50,737 INFO L225 Difference]: With dead ends: 81 [2018-10-23 09:55:50,737 INFO L226 Difference]: Without dead ends: 75 [2018-10-23 09:55:50,738 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-23 09:55:50,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-23 09:55:50,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-10-23 09:55:50,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-23 09:55:50,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-10-23 09:55:50,743 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 70 [2018-10-23 09:55:50,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:50,743 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-10-23 09:55:50,743 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-23 09:55:50,743 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-10-23 09:55:50,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-23 09:55:50,744 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:50,744 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:50,745 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:50,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:50,745 INFO L82 PathProgramCache]: Analyzing trace with hash 6773987, now seen corresponding path program 20 times [2018-10-23 09:55:50,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:50,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:50,746 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:50,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:50,746 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:50,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:51,192 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:51,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:51,192 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:51,192 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:51,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:51,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:51,192 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:51,201 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:55:51,201 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:55:51,257 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:55:51,257 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:51,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:51,282 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:51,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:51,969 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:51,991 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:51,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-23 09:55:51,991 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:51,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-23 09:55:51,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-23 09:55:51,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-23 09:55:51,993 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 24 states. [2018-10-23 09:55:52,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:52,219 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-23 09:55:52,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-23 09:55:52,223 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 73 [2018-10-23 09:55:52,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:52,224 INFO L225 Difference]: With dead ends: 84 [2018-10-23 09:55:52,224 INFO L226 Difference]: Without dead ends: 78 [2018-10-23 09:55:52,226 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-23 09:55:52,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-23 09:55:52,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-23 09:55:52,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-23 09:55:52,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2018-10-23 09:55:52,230 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 73 [2018-10-23 09:55:52,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:52,230 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2018-10-23 09:55:52,230 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-23 09:55:52,230 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2018-10-23 09:55:52,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-23 09:55:52,231 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:52,231 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:52,232 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:52,232 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:52,232 INFO L82 PathProgramCache]: Analyzing trace with hash 1034136154, now seen corresponding path program 21 times [2018-10-23 09:55:52,232 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:52,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:52,233 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:52,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:52,233 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:52,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:53,028 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:53,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:53,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:53,029 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:53,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:53,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:53,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:53,037 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:55:53,038 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:55:53,108 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:55:53,108 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:53,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:53,218 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:53,931 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:53,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:53,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2018-10-23 09:55:53,952 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:53,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-23 09:55:53,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-23 09:55:53,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-23 09:55:53,954 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 25 states. [2018-10-23 09:55:54,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:54,040 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-23 09:55:54,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-23 09:55:54,041 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 76 [2018-10-23 09:55:54,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:54,042 INFO L225 Difference]: With dead ends: 87 [2018-10-23 09:55:54,042 INFO L226 Difference]: Without dead ends: 81 [2018-10-23 09:55:54,043 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-23 09:55:54,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-10-23 09:55:54,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2018-10-23 09:55:54,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-23 09:55:54,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2018-10-23 09:55:54,046 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 76 [2018-10-23 09:55:54,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:54,046 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2018-10-23 09:55:54,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-23 09:55:54,046 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2018-10-23 09:55:54,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-23 09:55:54,047 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:54,047 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:54,047 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:54,047 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:54,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1243501955, now seen corresponding path program 22 times [2018-10-23 09:55:54,048 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:54,048 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:54,048 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:54,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:54,049 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:54,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:54,356 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:54,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:54,356 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:54,357 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:54,357 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:54,357 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:54,357 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:54,365 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:54,365 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:55:54,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:54,422 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:54,439 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:54,439 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:55,061 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:55,081 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:55,082 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-23 09:55:55,082 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:55,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-23 09:55:55,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-23 09:55:55,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-23 09:55:55,083 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand 26 states. [2018-10-23 09:55:55,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:55,245 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-23 09:55:55,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-23 09:55:55,245 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 79 [2018-10-23 09:55:55,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:55,246 INFO L225 Difference]: With dead ends: 90 [2018-10-23 09:55:55,246 INFO L226 Difference]: Without dead ends: 84 [2018-10-23 09:55:55,247 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-23 09:55:55,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-23 09:55:55,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2018-10-23 09:55:55,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-10-23 09:55:55,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2018-10-23 09:55:55,250 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 79 [2018-10-23 09:55:55,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:55,251 INFO L481 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2018-10-23 09:55:55,251 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-23 09:55:55,251 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2018-10-23 09:55:55,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-10-23 09:55:55,251 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:55,252 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:55,252 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:55,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:55,252 INFO L82 PathProgramCache]: Analyzing trace with hash -2127401542, now seen corresponding path program 23 times [2018-10-23 09:55:55,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:55,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:55,253 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:55,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:55,253 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:55,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:56,043 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:56,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:56,044 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:56,044 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:56,044 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:56,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:56,044 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:56,051 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:55:56,051 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:55:56,111 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:55:56,112 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:56,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:56,133 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:56,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:56,831 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:56,852 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:56,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-23 09:55:56,852 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:56,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-23 09:55:56,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-23 09:55:56,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-23 09:55:56,854 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 27 states. [2018-10-23 09:55:56,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:56,944 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-23 09:55:56,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-23 09:55:56,945 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 82 [2018-10-23 09:55:56,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:56,946 INFO L225 Difference]: With dead ends: 93 [2018-10-23 09:55:56,946 INFO L226 Difference]: Without dead ends: 87 [2018-10-23 09:55:56,948 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-23 09:55:56,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-23 09:55:56,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2018-10-23 09:55:56,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-10-23 09:55:56,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 86 transitions. [2018-10-23 09:55:56,952 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 86 transitions. Word has length 82 [2018-10-23 09:55:56,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:56,952 INFO L481 AbstractCegarLoop]: Abstraction has 86 states and 86 transitions. [2018-10-23 09:55:56,952 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-23 09:55:56,952 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 86 transitions. [2018-10-23 09:55:56,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-23 09:55:56,953 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:56,953 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:56,953 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:56,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:56,954 INFO L82 PathProgramCache]: Analyzing trace with hash 211834403, now seen corresponding path program 24 times [2018-10-23 09:55:56,954 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:56,954 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:56,955 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:56,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:56,955 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:56,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:57,346 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:57,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:57,346 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:57,346 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:57,347 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:57,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:57,347 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:57,354 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:55:57,354 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:55:57,419 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:55:57,419 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:55:57,422 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:57,479 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:57,479 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:55:58,232 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:58,253 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:55:58,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 53 [2018-10-23 09:55:58,253 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:55:58,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-23 09:55:58,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-23 09:55:58,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-23 09:55:58,255 INFO L87 Difference]: Start difference. First operand 86 states and 86 transitions. Second operand 28 states. [2018-10-23 09:55:58,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:55:58,398 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-23 09:55:58,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-23 09:55:58,402 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 85 [2018-10-23 09:55:58,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:55:58,403 INFO L225 Difference]: With dead ends: 96 [2018-10-23 09:55:58,403 INFO L226 Difference]: Without dead ends: 90 [2018-10-23 09:55:58,404 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-23 09:55:58,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-23 09:55:58,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-23 09:55:58,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-23 09:55:58,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2018-10-23 09:55:58,408 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 85 [2018-10-23 09:55:58,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:55:58,408 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2018-10-23 09:55:58,408 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-23 09:55:58,408 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2018-10-23 09:55:58,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-10-23 09:55:58,409 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:55:58,409 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:55:58,410 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:55:58,410 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:55:58,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1749472998, now seen corresponding path program 25 times [2018-10-23 09:55:58,410 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:55:58,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:58,411 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:55:58,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:55:58,411 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:55:58,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:58,836 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:58,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:58,836 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:55:58,836 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:55:58,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:55:58,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:55:58,837 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:55:58,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:55:58,845 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:55:58,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:55:58,910 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:55:58,938 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:55:58,939 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:00,142 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:00,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:00,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-23 09:56:00,162 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:00,163 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-23 09:56:00,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-23 09:56:00,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-23 09:56:00,164 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 29 states. [2018-10-23 09:56:00,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:00,257 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-23 09:56:00,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-23 09:56:00,258 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 88 [2018-10-23 09:56:00,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:00,259 INFO L225 Difference]: With dead ends: 99 [2018-10-23 09:56:00,259 INFO L226 Difference]: Without dead ends: 93 [2018-10-23 09:56:00,261 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-23 09:56:00,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2018-10-23 09:56:00,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2018-10-23 09:56:00,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-23 09:56:00,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2018-10-23 09:56:00,265 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 88 [2018-10-23 09:56:00,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:00,265 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2018-10-23 09:56:00,265 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-23 09:56:00,265 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2018-10-23 09:56:00,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-23 09:56:00,265 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:00,266 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:00,266 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:00,266 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:00,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1971805891, now seen corresponding path program 26 times [2018-10-23 09:56:00,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:00,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:00,267 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:00,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:00,267 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:00,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:00,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:00,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:00,746 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:00,746 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:00,746 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:00,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:00,746 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:56:00,753 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:56:00,754 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:56:00,819 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:56:00,819 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:00,822 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:00,842 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:00,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:01,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:01,795 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:01,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-23 09:56:01,795 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:01,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-23 09:56:01,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-23 09:56:01,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-23 09:56:01,797 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 30 states. [2018-10-23 09:56:01,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:01,919 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-23 09:56:01,920 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-23 09:56:01,920 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 91 [2018-10-23 09:56:01,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:01,921 INFO L225 Difference]: With dead ends: 102 [2018-10-23 09:56:01,921 INFO L226 Difference]: Without dead ends: 96 [2018-10-23 09:56:01,922 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-23 09:56:01,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-10-23 09:56:01,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2018-10-23 09:56:01,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2018-10-23 09:56:01,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2018-10-23 09:56:01,926 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 91 [2018-10-23 09:56:01,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:01,926 INFO L481 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2018-10-23 09:56:01,926 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-23 09:56:01,926 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2018-10-23 09:56:01,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-23 09:56:01,927 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:01,927 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:01,927 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:01,927 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:01,928 INFO L82 PathProgramCache]: Analyzing trace with hash 895343738, now seen corresponding path program 27 times [2018-10-23 09:56:01,928 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:01,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:01,929 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:01,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:01,929 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:01,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:03,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:03,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:03,376 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:03,376 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:03,377 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:03,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:03,377 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:56:03,385 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:56:03,385 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:56:03,452 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:56:03,452 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:03,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:03,488 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:03,488 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:04,676 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:04,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:04,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2018-10-23 09:56:04,696 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:04,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-23 09:56:04,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-23 09:56:04,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-23 09:56:04,698 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 31 states. [2018-10-23 09:56:04,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:04,865 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-23 09:56:04,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-23 09:56:04,865 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 94 [2018-10-23 09:56:04,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:04,866 INFO L225 Difference]: With dead ends: 105 [2018-10-23 09:56:04,866 INFO L226 Difference]: Without dead ends: 99 [2018-10-23 09:56:04,867 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-23 09:56:04,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-23 09:56:04,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-10-23 09:56:04,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-10-23 09:56:04,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 98 transitions. [2018-10-23 09:56:04,871 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 98 transitions. Word has length 94 [2018-10-23 09:56:04,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:04,872 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 98 transitions. [2018-10-23 09:56:04,872 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-23 09:56:04,872 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 98 transitions. [2018-10-23 09:56:04,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-23 09:56:04,873 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:04,873 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:04,873 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:04,873 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:04,873 INFO L82 PathProgramCache]: Analyzing trace with hash -1762824349, now seen corresponding path program 28 times [2018-10-23 09:56:04,874 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:04,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:04,874 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:04,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:04,875 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:04,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:05,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:05,422 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:05,422 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:05,423 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:05,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:05,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:05,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:56:05,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:05,431 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:56:05,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:05,508 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:05,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:05,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:06,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:06,796 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:06,796 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-23 09:56:06,796 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:06,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-23 09:56:06,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-23 09:56:06,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-23 09:56:06,801 INFO L87 Difference]: Start difference. First operand 98 states and 98 transitions. Second operand 32 states. [2018-10-23 09:56:06,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:06,922 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-23 09:56:06,922 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-23 09:56:06,922 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 97 [2018-10-23 09:56:06,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:06,924 INFO L225 Difference]: With dead ends: 108 [2018-10-23 09:56:06,924 INFO L226 Difference]: Without dead ends: 102 [2018-10-23 09:56:06,925 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-23 09:56:06,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-23 09:56:06,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-23 09:56:06,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-23 09:56:06,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2018-10-23 09:56:06,929 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 97 [2018-10-23 09:56:06,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:06,929 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2018-10-23 09:56:06,929 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-23 09:56:06,929 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2018-10-23 09:56:06,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-10-23 09:56:06,930 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:06,930 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:06,931 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:06,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:06,931 INFO L82 PathProgramCache]: Analyzing trace with hash -641300518, now seen corresponding path program 29 times [2018-10-23 09:56:06,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:06,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:06,932 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:06,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:06,932 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:06,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:07,448 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:07,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:07,449 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:07,449 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:07,449 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:07,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:07,449 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:56:07,456 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:56:07,457 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:56:07,523 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:56:07,523 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:07,526 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:07,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:07,579 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:08,719 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:08,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:08,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-23 09:56:08,740 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:08,741 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-23 09:56:08,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-23 09:56:08,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-23 09:56:08,742 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 33 states. [2018-10-23 09:56:08,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:08,947 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-23 09:56:08,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-23 09:56:08,947 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 100 [2018-10-23 09:56:08,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:08,948 INFO L225 Difference]: With dead ends: 111 [2018-10-23 09:56:08,949 INFO L226 Difference]: Without dead ends: 105 [2018-10-23 09:56:08,950 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-23 09:56:08,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-23 09:56:08,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-10-23 09:56:08,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-10-23 09:56:08,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 104 transitions. [2018-10-23 09:56:08,954 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 104 transitions. Word has length 100 [2018-10-23 09:56:08,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:08,954 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 104 transitions. [2018-10-23 09:56:08,955 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-23 09:56:08,955 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 104 transitions. [2018-10-23 09:56:08,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-23 09:56:08,955 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:08,955 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:08,955 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:08,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:08,956 INFO L82 PathProgramCache]: Analyzing trace with hash 124553219, now seen corresponding path program 30 times [2018-10-23 09:56:08,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:08,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:08,956 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:08,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:08,957 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:08,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:10,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:10,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:10,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:10,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:10,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:10,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:10,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:56:10,705 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:56:10,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:56:10,774 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:56:10,775 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:10,777 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:10,802 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:10,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:12,215 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:12,238 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:12,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 65 [2018-10-23 09:56:12,238 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:12,238 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-23 09:56:12,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-23 09:56:12,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-23 09:56:12,240 INFO L87 Difference]: Start difference. First operand 104 states and 104 transitions. Second operand 34 states. [2018-10-23 09:56:12,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:12,372 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-23 09:56:12,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-23 09:56:12,373 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 103 [2018-10-23 09:56:12,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:12,374 INFO L225 Difference]: With dead ends: 114 [2018-10-23 09:56:12,374 INFO L226 Difference]: Without dead ends: 108 [2018-10-23 09:56:12,375 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-23 09:56:12,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-10-23 09:56:12,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2018-10-23 09:56:12,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-23 09:56:12,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2018-10-23 09:56:12,378 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 103 [2018-10-23 09:56:12,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:12,379 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2018-10-23 09:56:12,379 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-23 09:56:12,379 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2018-10-23 09:56:12,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-23 09:56:12,380 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:12,380 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:12,380 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:12,380 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:12,380 INFO L82 PathProgramCache]: Analyzing trace with hash 806955834, now seen corresponding path program 31 times [2018-10-23 09:56:12,380 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:12,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:12,381 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:12,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:12,382 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:12,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:13,201 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:13,201 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:13,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:13,202 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:13,202 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:13,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:13,202 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:56:13,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:13,212 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:56:13,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:13,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:13,317 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:13,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:14,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:14,430 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:14,431 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2018-10-23 09:56:14,431 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:14,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-23 09:56:14,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-23 09:56:14,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-23 09:56:14,433 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 35 states. [2018-10-23 09:56:14,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:14,572 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-23 09:56:14,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-23 09:56:14,572 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 106 [2018-10-23 09:56:14,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:14,573 INFO L225 Difference]: With dead ends: 117 [2018-10-23 09:56:14,573 INFO L226 Difference]: Without dead ends: 111 [2018-10-23 09:56:14,574 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2211, Invalid=2211, Unknown=0, NotChecked=0, Total=4422 [2018-10-23 09:56:14,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-10-23 09:56:14,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-10-23 09:56:14,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-23 09:56:14,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 110 transitions. [2018-10-23 09:56:14,578 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 110 transitions. Word has length 106 [2018-10-23 09:56:14,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:14,578 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 110 transitions. [2018-10-23 09:56:14,578 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-23 09:56:14,579 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 110 transitions. [2018-10-23 09:56:14,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-23 09:56:14,579 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:14,579 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:14,580 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:14,580 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:14,580 INFO L82 PathProgramCache]: Analyzing trace with hash -2111919965, now seen corresponding path program 32 times [2018-10-23 09:56:14,580 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:14,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:14,581 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:14,581 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:14,581 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:14,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:15,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:15,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:15,966 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:15,966 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:15,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:15,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:15,966 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:56:15,974 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:56:15,974 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:56:16,052 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:56:16,052 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:16,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:16,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:16,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:17,688 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:17,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:17,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 69 [2018-10-23 09:56:17,711 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:17,711 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-23 09:56:17,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-23 09:56:17,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-23 09:56:17,713 INFO L87 Difference]: Start difference. First operand 110 states and 110 transitions. Second operand 36 states. [2018-10-23 09:56:17,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:17,848 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-23 09:56:17,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-23 09:56:17,848 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 109 [2018-10-23 09:56:17,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:17,849 INFO L225 Difference]: With dead ends: 120 [2018-10-23 09:56:17,849 INFO L226 Difference]: Without dead ends: 114 [2018-10-23 09:56:17,850 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2346, Invalid=2346, Unknown=0, NotChecked=0, Total=4692 [2018-10-23 09:56:17,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-23 09:56:17,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-23 09:56:17,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-23 09:56:17,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2018-10-23 09:56:17,854 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 109 [2018-10-23 09:56:17,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:17,854 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2018-10-23 09:56:17,854 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-23 09:56:17,855 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2018-10-23 09:56:17,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2018-10-23 09:56:17,855 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:17,856 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:17,856 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:17,856 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:17,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1861994138, now seen corresponding path program 33 times [2018-10-23 09:56:17,856 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:17,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:17,857 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:17,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:17,857 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:17,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:18,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:18,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:18,516 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:18,516 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:18,516 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:18,516 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:18,516 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:56:18,524 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:56:18,524 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:56:18,600 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:56:18,600 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:18,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:18,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:18,632 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:19,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:19,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:19,907 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 71 [2018-10-23 09:56:19,907 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:19,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-23 09:56:19,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-23 09:56:19,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-23 09:56:19,908 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 37 states. [2018-10-23 09:56:20,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:20,037 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-23 09:56:20,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-23 09:56:20,038 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 112 [2018-10-23 09:56:20,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:20,039 INFO L225 Difference]: With dead ends: 123 [2018-10-23 09:56:20,039 INFO L226 Difference]: Without dead ends: 117 [2018-10-23 09:56:20,040 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2485, Invalid=2485, Unknown=0, NotChecked=0, Total=4970 [2018-10-23 09:56:20,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-23 09:56:20,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2018-10-23 09:56:20,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-10-23 09:56:20,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2018-10-23 09:56:20,043 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 112 [2018-10-23 09:56:20,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:20,043 INFO L481 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2018-10-23 09:56:20,044 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-23 09:56:20,044 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2018-10-23 09:56:20,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-23 09:56:20,044 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:20,045 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:20,045 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:20,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:20,045 INFO L82 PathProgramCache]: Analyzing trace with hash -2036477629, now seen corresponding path program 34 times [2018-10-23 09:56:20,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:20,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:20,046 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:20,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:20,046 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:20,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:20,627 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:20,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:20,628 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:20,628 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:20,628 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:20,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:20,628 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:20,637 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:20,637 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:56:20,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:20,719 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:20,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:20,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:22,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:22,578 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:22,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 73 [2018-10-23 09:56:22,578 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:22,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-23 09:56:22,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-23 09:56:22,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-23 09:56:22,579 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 38 states. [2018-10-23 09:56:22,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:22,692 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-23 09:56:22,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-23 09:56:22,692 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 115 [2018-10-23 09:56:22,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:22,694 INFO L225 Difference]: With dead ends: 126 [2018-10-23 09:56:22,694 INFO L226 Difference]: Without dead ends: 120 [2018-10-23 09:56:22,694 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2628, Invalid=2628, Unknown=0, NotChecked=0, Total=5256 [2018-10-23 09:56:22,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-23 09:56:22,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2018-10-23 09:56:22,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-23 09:56:22,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2018-10-23 09:56:22,699 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 115 [2018-10-23 09:56:22,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:22,699 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2018-10-23 09:56:22,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-23 09:56:22,699 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2018-10-23 09:56:22,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-10-23 09:56:22,700 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:22,700 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:22,700 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:22,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:22,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1198237190, now seen corresponding path program 35 times [2018-10-23 09:56:22,700 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:22,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:22,701 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:22,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:22,701 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:22,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:23,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:23,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:23,324 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:23,325 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:23,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:23,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:23,325 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:23,332 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:56:23,332 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:56:23,413 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:56:23,413 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:23,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:23,531 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:23,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:25,737 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:25,759 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:25,759 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 75 [2018-10-23 09:56:25,759 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:25,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-23 09:56:25,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-23 09:56:25,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-23 09:56:25,761 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 39 states. [2018-10-23 09:56:25,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:25,881 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-23 09:56:25,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-23 09:56:25,883 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 118 [2018-10-23 09:56:25,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:25,884 INFO L225 Difference]: With dead ends: 129 [2018-10-23 09:56:25,885 INFO L226 Difference]: Without dead ends: 123 [2018-10-23 09:56:25,885 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2775, Invalid=2775, Unknown=0, NotChecked=0, Total=5550 [2018-10-23 09:56:25,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-10-23 09:56:25,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-10-23 09:56:25,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-23 09:56:25,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 122 transitions. [2018-10-23 09:56:25,889 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 122 transitions. Word has length 118 [2018-10-23 09:56:25,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:25,890 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 122 transitions. [2018-10-23 09:56:25,890 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-23 09:56:25,890 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 122 transitions. [2018-10-23 09:56:25,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-10-23 09:56:25,891 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:25,891 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:25,891 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:25,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:25,891 INFO L82 PathProgramCache]: Analyzing trace with hash -117177885, now seen corresponding path program 36 times [2018-10-23 09:56:25,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:25,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:25,892 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:25,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:25,893 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:25,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:26,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:26,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:26,880 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:26,880 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:26,880 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:26,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:26,880 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:26,887 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:56:26,887 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:56:26,982 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:56:26,982 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:26,987 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:27,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:27,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:29,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:29,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:29,163 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 77 [2018-10-23 09:56:29,163 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:29,163 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-23 09:56:29,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-23 09:56:29,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-23 09:56:29,164 INFO L87 Difference]: Start difference. First operand 122 states and 122 transitions. Second operand 40 states. [2018-10-23 09:56:29,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:29,820 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-23 09:56:29,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-23 09:56:29,823 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 121 [2018-10-23 09:56:29,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:29,824 INFO L225 Difference]: With dead ends: 132 [2018-10-23 09:56:29,824 INFO L226 Difference]: Without dead ends: 126 [2018-10-23 09:56:29,825 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2926, Invalid=2926, Unknown=0, NotChecked=0, Total=5852 [2018-10-23 09:56:29,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-23 09:56:29,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-10-23 09:56:29,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-10-23 09:56:29,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2018-10-23 09:56:29,829 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 121 [2018-10-23 09:56:29,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:29,830 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2018-10-23 09:56:29,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-23 09:56:29,830 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2018-10-23 09:56:29,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-23 09:56:29,830 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:29,831 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:29,831 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:29,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:29,831 INFO L82 PathProgramCache]: Analyzing trace with hash 2055791962, now seen corresponding path program 37 times [2018-10-23 09:56:29,831 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:29,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:29,832 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:29,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:29,832 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:29,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:30,708 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:30,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:30,709 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:30,709 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:30,709 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:30,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:30,709 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:30,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:30,717 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:56:30,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:30,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:30,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:30,837 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:32,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:32,683 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:32,683 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 79 [2018-10-23 09:56:32,683 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:32,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-23 09:56:32,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-23 09:56:32,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-23 09:56:32,685 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 41 states. [2018-10-23 09:56:32,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:32,838 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-23 09:56:32,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-23 09:56:32,844 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 124 [2018-10-23 09:56:32,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:32,845 INFO L225 Difference]: With dead ends: 135 [2018-10-23 09:56:32,845 INFO L226 Difference]: Without dead ends: 129 [2018-10-23 09:56:32,846 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3081, Invalid=3081, Unknown=0, NotChecked=0, Total=6162 [2018-10-23 09:56:32,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-23 09:56:32,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 128. [2018-10-23 09:56:32,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-10-23 09:56:32,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 128 transitions. [2018-10-23 09:56:32,850 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 128 transitions. Word has length 124 [2018-10-23 09:56:32,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:32,850 INFO L481 AbstractCegarLoop]: Abstraction has 128 states and 128 transitions. [2018-10-23 09:56:32,850 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-23 09:56:32,850 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 128 transitions. [2018-10-23 09:56:32,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-23 09:56:32,851 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:32,851 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:32,851 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:32,851 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:32,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1041548669, now seen corresponding path program 38 times [2018-10-23 09:56:32,852 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:32,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:32,852 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:32,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:32,853 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:32,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:33,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:33,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:33,598 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:33,598 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:33,598 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:33,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:33,598 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:33,605 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:56:33,606 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:56:33,689 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:56:33,689 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:33,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:33,733 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:33,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:35,458 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:35,479 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:35,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 81 [2018-10-23 09:56:35,479 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:35,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-23 09:56:35,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-23 09:56:35,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-23 09:56:35,481 INFO L87 Difference]: Start difference. First operand 128 states and 128 transitions. Second operand 42 states. [2018-10-23 09:56:35,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:35,644 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-23 09:56:35,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-23 09:56:35,644 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 127 [2018-10-23 09:56:35,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:35,646 INFO L225 Difference]: With dead ends: 138 [2018-10-23 09:56:35,646 INFO L226 Difference]: Without dead ends: 132 [2018-10-23 09:56:35,647 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 215 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3240, Invalid=3240, Unknown=0, NotChecked=0, Total=6480 [2018-10-23 09:56:35,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-23 09:56:35,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2018-10-23 09:56:35,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-10-23 09:56:35,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2018-10-23 09:56:35,651 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 127 [2018-10-23 09:56:35,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:35,651 INFO L481 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2018-10-23 09:56:35,651 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-23 09:56:35,651 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2018-10-23 09:56:35,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-10-23 09:56:35,652 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:35,652 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:35,652 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:35,653 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:35,653 INFO L82 PathProgramCache]: Analyzing trace with hash -838899526, now seen corresponding path program 39 times [2018-10-23 09:56:35,653 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:35,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:35,654 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:35,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:35,654 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:35,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:36,994 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:36,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:36,994 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:36,994 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:36,994 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:36,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:36,994 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:37,002 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:56:37,002 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:56:37,090 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:56:37,091 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:37,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:37,223 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:37,223 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:39,011 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:39,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:39,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 83 [2018-10-23 09:56:39,032 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:39,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-23 09:56:39,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-23 09:56:39,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3403, Invalid=3403, Unknown=0, NotChecked=0, Total=6806 [2018-10-23 09:56:39,034 INFO L87 Difference]: Start difference. First operand 131 states and 131 transitions. Second operand 43 states. [2018-10-23 09:56:39,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:39,289 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-23 09:56:39,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-23 09:56:39,290 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 130 [2018-10-23 09:56:39,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:39,291 INFO L225 Difference]: With dead ends: 141 [2018-10-23 09:56:39,291 INFO L226 Difference]: Without dead ends: 135 [2018-10-23 09:56:39,292 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3403, Invalid=3403, Unknown=0, NotChecked=0, Total=6806 [2018-10-23 09:56:39,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-23 09:56:39,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2018-10-23 09:56:39,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-10-23 09:56:39,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 134 transitions. [2018-10-23 09:56:39,296 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 134 transitions. Word has length 130 [2018-10-23 09:56:39,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:39,296 INFO L481 AbstractCegarLoop]: Abstraction has 134 states and 134 transitions. [2018-10-23 09:56:39,296 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-23 09:56:39,297 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 134 transitions. [2018-10-23 09:56:39,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-10-23 09:56:39,297 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:39,298 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:39,298 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:39,298 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:39,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1852668707, now seen corresponding path program 40 times [2018-10-23 09:56:39,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:39,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:39,299 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:39,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:39,299 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:39,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:40,165 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:40,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:40,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:40,166 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:40,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:40,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:40,166 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:40,174 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:40,174 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:56:40,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:40,266 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:40,296 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:40,296 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:42,607 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:42,638 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:42,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 85 [2018-10-23 09:56:42,639 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:42,639 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-23 09:56:42,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-23 09:56:42,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-23 09:56:42,641 INFO L87 Difference]: Start difference. First operand 134 states and 134 transitions. Second operand 44 states. [2018-10-23 09:56:42,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:42,866 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-23 09:56:42,866 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-23 09:56:42,866 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 133 [2018-10-23 09:56:42,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:42,868 INFO L225 Difference]: With dead ends: 144 [2018-10-23 09:56:42,868 INFO L226 Difference]: Without dead ends: 138 [2018-10-23 09:56:42,869 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3570, Invalid=3570, Unknown=0, NotChecked=0, Total=7140 [2018-10-23 09:56:42,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-10-23 09:56:42,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2018-10-23 09:56:42,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-23 09:56:42,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 137 transitions. [2018-10-23 09:56:42,873 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 137 transitions. Word has length 133 [2018-10-23 09:56:42,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:42,874 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 137 transitions. [2018-10-23 09:56:42,874 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-23 09:56:42,874 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 137 transitions. [2018-10-23 09:56:42,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-10-23 09:56:42,875 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:42,875 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:42,875 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:42,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:42,876 INFO L82 PathProgramCache]: Analyzing trace with hash -677518310, now seen corresponding path program 41 times [2018-10-23 09:56:42,876 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:42,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:42,876 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:42,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:42,877 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:42,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:43,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:43,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:43,790 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:43,790 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:43,790 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:43,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:43,791 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:43,799 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:56:43,799 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:56:43,894 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:56:43,894 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:43,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:44,003 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:44,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:45,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:45,926 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:45,927 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 87 [2018-10-23 09:56:45,927 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:45,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-23 09:56:45,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-23 09:56:45,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-23 09:56:45,929 INFO L87 Difference]: Start difference. First operand 137 states and 137 transitions. Second operand 45 states. [2018-10-23 09:56:46,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:46,205 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-23 09:56:46,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-23 09:56:46,207 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 136 [2018-10-23 09:56:46,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:46,208 INFO L225 Difference]: With dead ends: 147 [2018-10-23 09:56:46,208 INFO L226 Difference]: Without dead ends: 141 [2018-10-23 09:56:46,209 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 230 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3741, Invalid=3741, Unknown=0, NotChecked=0, Total=7482 [2018-10-23 09:56:46,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-23 09:56:46,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 140. [2018-10-23 09:56:46,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-10-23 09:56:46,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2018-10-23 09:56:46,219 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 136 [2018-10-23 09:56:46,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:46,219 INFO L481 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2018-10-23 09:56:46,219 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-23 09:56:46,220 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2018-10-23 09:56:46,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-10-23 09:56:46,220 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:46,221 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:46,221 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:46,221 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:46,221 INFO L82 PathProgramCache]: Analyzing trace with hash -802896957, now seen corresponding path program 42 times [2018-10-23 09:56:46,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:46,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:46,222 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:46,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:46,222 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:46,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:47,280 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:47,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:47,281 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:47,281 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:47,281 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:47,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:47,281 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:47,313 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:56:47,314 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:56:47,408 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:56:47,408 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:47,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:47,535 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:47,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:49,656 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:49,676 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:49,677 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 89 [2018-10-23 09:56:49,677 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:49,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-23 09:56:49,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-23 09:56:49,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3916, Invalid=3916, Unknown=0, NotChecked=0, Total=7832 [2018-10-23 09:56:49,678 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 46 states. [2018-10-23 09:56:49,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:49,852 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-23 09:56:49,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-23 09:56:49,852 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 139 [2018-10-23 09:56:49,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:49,854 INFO L225 Difference]: With dead ends: 150 [2018-10-23 09:56:49,854 INFO L226 Difference]: Without dead ends: 144 [2018-10-23 09:56:49,855 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 235 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3916, Invalid=3916, Unknown=0, NotChecked=0, Total=7832 [2018-10-23 09:56:49,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2018-10-23 09:56:49,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2018-10-23 09:56:49,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-10-23 09:56:49,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 143 transitions. [2018-10-23 09:56:49,859 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 143 transitions. Word has length 139 [2018-10-23 09:56:49,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:49,859 INFO L481 AbstractCegarLoop]: Abstraction has 143 states and 143 transitions. [2018-10-23 09:56:49,859 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-23 09:56:49,859 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 143 transitions. [2018-10-23 09:56:49,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2018-10-23 09:56:49,860 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:49,860 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:49,861 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:49,861 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:49,861 INFO L82 PathProgramCache]: Analyzing trace with hash 663377786, now seen corresponding path program 43 times [2018-10-23 09:56:49,861 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:49,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:49,862 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:49,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:49,862 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:49,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:50,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:50,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:50,808 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:50,808 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:50,808 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:50,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:50,809 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:50,817 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:50,817 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:56:50,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:50,911 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:50,945 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:50,945 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:53,376 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:53,397 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:53,397 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 91 [2018-10-23 09:56:53,398 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:53,398 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-23 09:56:53,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-23 09:56:53,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-23 09:56:53,399 INFO L87 Difference]: Start difference. First operand 143 states and 143 transitions. Second operand 47 states. [2018-10-23 09:56:53,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:53,558 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-23 09:56:53,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-23 09:56:53,558 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 142 [2018-10-23 09:56:53,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:53,560 INFO L225 Difference]: With dead ends: 153 [2018-10-23 09:56:53,560 INFO L226 Difference]: Without dead ends: 147 [2018-10-23 09:56:53,561 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 240 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=4095, Invalid=4095, Unknown=0, NotChecked=0, Total=8190 [2018-10-23 09:56:53,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-10-23 09:56:53,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 146. [2018-10-23 09:56:53,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-10-23 09:56:53,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 146 transitions. [2018-10-23 09:56:53,565 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 146 transitions. Word has length 142 [2018-10-23 09:56:53,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:53,565 INFO L481 AbstractCegarLoop]: Abstraction has 146 states and 146 transitions. [2018-10-23 09:56:53,565 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-23 09:56:53,565 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 146 transitions. [2018-10-23 09:56:53,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-10-23 09:56:53,566 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:53,566 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:53,566 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:53,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:53,567 INFO L82 PathProgramCache]: Analyzing trace with hash -1658121117, now seen corresponding path program 44 times [2018-10-23 09:56:53,567 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:53,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:53,568 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:56:53,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:53,568 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:53,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:54,498 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:54,498 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:54,498 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:54,498 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:54,498 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:54,498 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:54,499 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:54,506 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:56:54,507 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:56:54,611 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:56:54,611 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:54,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:54,703 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:54,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:56:56,951 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:56,971 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:56:56,972 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 93 [2018-10-23 09:56:56,972 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:56:56,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-23 09:56:56,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-23 09:56:56,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-23 09:56:56,973 INFO L87 Difference]: Start difference. First operand 146 states and 146 transitions. Second operand 48 states. [2018-10-23 09:56:57,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:56:57,722 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-23 09:56:57,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-23 09:56:57,722 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 145 [2018-10-23 09:56:57,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:56:57,724 INFO L225 Difference]: With dead ends: 156 [2018-10-23 09:56:57,724 INFO L226 Difference]: Without dead ends: 150 [2018-10-23 09:56:57,725 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 245 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4278, Invalid=4278, Unknown=0, NotChecked=0, Total=8556 [2018-10-23 09:56:57,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-23 09:56:57,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2018-10-23 09:56:57,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-10-23 09:56:57,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 149 transitions. [2018-10-23 09:56:57,729 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 149 transitions. Word has length 145 [2018-10-23 09:56:57,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:56:57,729 INFO L481 AbstractCegarLoop]: Abstraction has 149 states and 149 transitions. [2018-10-23 09:56:57,730 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-23 09:56:57,730 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 149 transitions. [2018-10-23 09:56:57,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2018-10-23 09:56:57,730 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:56:57,731 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:56:57,731 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:56:57,731 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:56:57,731 INFO L82 PathProgramCache]: Analyzing trace with hash 426427098, now seen corresponding path program 45 times [2018-10-23 09:56:57,731 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:56:57,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:57,732 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:56:57,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:56:57,732 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:56:57,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:56:58,961 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:58,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:58,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:56:58,962 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:56:58,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:56:58,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:56:58,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:56:58,970 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:56:58,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:56:59,073 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:56:59,074 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:56:59,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:56:59,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:56:59,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:02,004 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:02,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:02,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 95 [2018-10-23 09:57:02,025 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:02,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-23 09:57:02,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-23 09:57:02,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4465, Invalid=4465, Unknown=0, NotChecked=0, Total=8930 [2018-10-23 09:57:02,027 INFO L87 Difference]: Start difference. First operand 149 states and 149 transitions. Second operand 49 states. [2018-10-23 09:57:02,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:02,267 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-23 09:57:02,268 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-23 09:57:02,268 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 148 [2018-10-23 09:57:02,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:02,270 INFO L225 Difference]: With dead ends: 159 [2018-10-23 09:57:02,270 INFO L226 Difference]: Without dead ends: 153 [2018-10-23 09:57:02,271 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 250 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4465, Invalid=4465, Unknown=0, NotChecked=0, Total=8930 [2018-10-23 09:57:02,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2018-10-23 09:57:02,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2018-10-23 09:57:02,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-10-23 09:57:02,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 152 transitions. [2018-10-23 09:57:02,276 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 152 transitions. Word has length 148 [2018-10-23 09:57:02,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:02,276 INFO L481 AbstractCegarLoop]: Abstraction has 152 states and 152 transitions. [2018-10-23 09:57:02,276 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-23 09:57:02,277 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 152 transitions. [2018-10-23 09:57:02,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-10-23 09:57:02,277 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:02,278 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:02,278 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:02,278 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:02,278 INFO L82 PathProgramCache]: Analyzing trace with hash 270167299, now seen corresponding path program 46 times [2018-10-23 09:57:02,278 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:02,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:02,279 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:57:02,279 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:02,279 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:02,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:03,323 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:03,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:03,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:03,323 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:03,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:03,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:03,323 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:03,335 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:57:03,335 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:57:03,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:03,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:03,476 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:03,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:05,853 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:05,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:05,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2018-10-23 09:57:05,874 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:05,874 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-23 09:57:05,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-23 09:57:05,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-23 09:57:05,876 INFO L87 Difference]: Start difference. First operand 152 states and 152 transitions. Second operand 50 states. [2018-10-23 09:57:06,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:06,086 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-23 09:57:06,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-23 09:57:06,086 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 151 [2018-10-23 09:57:06,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:06,087 INFO L225 Difference]: With dead ends: 162 [2018-10-23 09:57:06,087 INFO L226 Difference]: Without dead ends: 156 [2018-10-23 09:57:06,089 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 255 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=4656, Invalid=4656, Unknown=0, NotChecked=0, Total=9312 [2018-10-23 09:57:06,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-10-23 09:57:06,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2018-10-23 09:57:06,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2018-10-23 09:57:06,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 155 transitions. [2018-10-23 09:57:06,093 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 155 transitions. Word has length 151 [2018-10-23 09:57:06,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:06,094 INFO L481 AbstractCegarLoop]: Abstraction has 155 states and 155 transitions. [2018-10-23 09:57:06,094 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-23 09:57:06,094 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 155 transitions. [2018-10-23 09:57:06,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-10-23 09:57:06,095 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:06,095 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:06,095 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:06,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:06,095 INFO L82 PathProgramCache]: Analyzing trace with hash 879044154, now seen corresponding path program 47 times [2018-10-23 09:57:06,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:06,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:06,096 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:57:06,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:06,096 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:06,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:07,170 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:07,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:07,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:07,170 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:07,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:07,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:07,170 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:07,177 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:57:07,178 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:57:07,286 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:57:07,286 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:57:07,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:07,356 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:07,356 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:10,043 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:10,065 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:10,065 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 99 [2018-10-23 09:57:10,065 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:10,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-23 09:57:10,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-23 09:57:10,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-23 09:57:10,067 INFO L87 Difference]: Start difference. First operand 155 states and 155 transitions. Second operand 51 states. [2018-10-23 09:57:10,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:10,258 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-23 09:57:10,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-23 09:57:10,258 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 154 [2018-10-23 09:57:10,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:10,259 INFO L225 Difference]: With dead ends: 165 [2018-10-23 09:57:10,259 INFO L226 Difference]: Without dead ends: 159 [2018-10-23 09:57:10,260 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 260 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4851, Invalid=4851, Unknown=0, NotChecked=0, Total=9702 [2018-10-23 09:57:10,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-23 09:57:10,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 158. [2018-10-23 09:57:10,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2018-10-23 09:57:10,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 158 transitions. [2018-10-23 09:57:10,264 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 158 transitions. Word has length 154 [2018-10-23 09:57:10,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:10,264 INFO L481 AbstractCegarLoop]: Abstraction has 158 states and 158 transitions. [2018-10-23 09:57:10,264 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-23 09:57:10,264 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 158 transitions. [2018-10-23 09:57:10,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-10-23 09:57:10,265 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:10,265 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:10,265 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:10,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:10,265 INFO L82 PathProgramCache]: Analyzing trace with hash -2012426845, now seen corresponding path program 48 times [2018-10-23 09:57:10,265 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:10,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:10,266 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:57:10,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:10,266 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:10,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:11,411 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:11,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:11,411 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:11,411 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:11,411 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:11,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:11,411 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:11,419 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:57:11,419 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:57:11,538 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:57:11,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:57:11,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:11,665 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:11,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:14,939 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:14,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:14,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 101 [2018-10-23 09:57:14,960 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:14,960 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-23 09:57:14,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-23 09:57:14,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5050, Invalid=5050, Unknown=0, NotChecked=0, Total=10100 [2018-10-23 09:57:14,962 INFO L87 Difference]: Start difference. First operand 158 states and 158 transitions. Second operand 52 states. [2018-10-23 09:57:15,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:15,171 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-23 09:57:15,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-23 09:57:15,171 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 157 [2018-10-23 09:57:15,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:15,172 INFO L225 Difference]: With dead ends: 168 [2018-10-23 09:57:15,173 INFO L226 Difference]: Without dead ends: 162 [2018-10-23 09:57:15,173 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 265 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5050, Invalid=5050, Unknown=0, NotChecked=0, Total=10100 [2018-10-23 09:57:15,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-23 09:57:15,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2018-10-23 09:57:15,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2018-10-23 09:57:15,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 161 transitions. [2018-10-23 09:57:15,177 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 161 transitions. Word has length 157 [2018-10-23 09:57:15,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:15,177 INFO L481 AbstractCegarLoop]: Abstraction has 161 states and 161 transitions. [2018-10-23 09:57:15,177 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-23 09:57:15,177 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 161 transitions. [2018-10-23 09:57:15,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-10-23 09:57:15,178 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:15,178 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:15,178 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:15,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:15,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1960869478, now seen corresponding path program 49 times [2018-10-23 09:57:15,178 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:15,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:15,179 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:57:15,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:15,179 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:15,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:16,367 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:16,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:16,368 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:16,368 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:16,368 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:16,368 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:16,368 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:16,377 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:57:16,377 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:57:16,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:16,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:16,531 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:16,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:19,729 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:19,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:19,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 103 [2018-10-23 09:57:19,751 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:19,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-23 09:57:19,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-23 09:57:19,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-23 09:57:19,752 INFO L87 Difference]: Start difference. First operand 161 states and 161 transitions. Second operand 53 states. [2018-10-23 09:57:19,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:19,973 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-23 09:57:19,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-23 09:57:19,973 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 160 [2018-10-23 09:57:19,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:19,975 INFO L225 Difference]: With dead ends: 171 [2018-10-23 09:57:19,975 INFO L226 Difference]: Without dead ends: 165 [2018-10-23 09:57:19,975 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5253, Invalid=5253, Unknown=0, NotChecked=0, Total=10506 [2018-10-23 09:57:19,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-10-23 09:57:19,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 164. [2018-10-23 09:57:19,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-10-23 09:57:19,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 164 transitions. [2018-10-23 09:57:19,979 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 164 transitions. Word has length 160 [2018-10-23 09:57:19,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:19,979 INFO L481 AbstractCegarLoop]: Abstraction has 164 states and 164 transitions. [2018-10-23 09:57:19,979 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-23 09:57:19,979 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 164 transitions. [2018-10-23 09:57:19,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-10-23 09:57:19,980 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:19,980 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:19,980 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:19,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:19,981 INFO L82 PathProgramCache]: Analyzing trace with hash 681326147, now seen corresponding path program 50 times [2018-10-23 09:57:19,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:19,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:19,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:57:19,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:19,982 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:20,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:21,402 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:21,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:21,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:21,403 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:21,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:21,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:21,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:21,413 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:57:21,413 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:57:21,526 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:57:21,526 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:57:21,530 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:21,568 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:21,568 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:24,643 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:24,666 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:24,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 105 [2018-10-23 09:57:24,666 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:24,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-23 09:57:24,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-23 09:57:24,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-23 09:57:24,669 INFO L87 Difference]: Start difference. First operand 164 states and 164 transitions. Second operand 54 states. [2018-10-23 09:57:24,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:24,885 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-23 09:57:24,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-23 09:57:24,885 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 163 [2018-10-23 09:57:24,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:24,886 INFO L225 Difference]: With dead ends: 174 [2018-10-23 09:57:24,886 INFO L226 Difference]: Without dead ends: 168 [2018-10-23 09:57:24,887 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 275 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5460, Invalid=5460, Unknown=0, NotChecked=0, Total=10920 [2018-10-23 09:57:24,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-10-23 09:57:24,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 167. [2018-10-23 09:57:24,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-23 09:57:24,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 167 transitions. [2018-10-23 09:57:24,891 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 167 transitions. Word has length 163 [2018-10-23 09:57:24,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:24,891 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 167 transitions. [2018-10-23 09:57:24,891 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-23 09:57:24,891 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 167 transitions. [2018-10-23 09:57:24,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-10-23 09:57:24,892 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:24,892 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:24,893 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:24,893 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:24,893 INFO L82 PathProgramCache]: Analyzing trace with hash 465556730, now seen corresponding path program 51 times [2018-10-23 09:57:24,893 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:24,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:24,894 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:57:24,894 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:24,894 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:24,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:26,112 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:26,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:26,113 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:26,113 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:26,113 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:26,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:26,113 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:26,122 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:57:26,123 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:57:26,230 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:57:26,231 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:57:26,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:26,274 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:26,274 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:29,446 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:29,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:29,468 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 107 [2018-10-23 09:57:29,468 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:29,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-23 09:57:29,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-23 09:57:29,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5671, Invalid=5671, Unknown=0, NotChecked=0, Total=11342 [2018-10-23 09:57:29,471 INFO L87 Difference]: Start difference. First operand 167 states and 167 transitions. Second operand 55 states. [2018-10-23 09:57:29,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:29,682 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-23 09:57:29,682 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-23 09:57:29,682 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 166 [2018-10-23 09:57:29,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:29,683 INFO L225 Difference]: With dead ends: 177 [2018-10-23 09:57:29,683 INFO L226 Difference]: Without dead ends: 171 [2018-10-23 09:57:29,684 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 280 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5671, Invalid=5671, Unknown=0, NotChecked=0, Total=11342 [2018-10-23 09:57:29,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-10-23 09:57:29,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2018-10-23 09:57:29,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-10-23 09:57:29,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 170 transitions. [2018-10-23 09:57:29,687 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 170 transitions. Word has length 166 [2018-10-23 09:57:29,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:29,687 INFO L481 AbstractCegarLoop]: Abstraction has 170 states and 170 transitions. [2018-10-23 09:57:29,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-23 09:57:29,688 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 170 transitions. [2018-10-23 09:57:29,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-10-23 09:57:29,689 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:29,689 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:29,689 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:29,689 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:29,689 INFO L82 PathProgramCache]: Analyzing trace with hash 2044896995, now seen corresponding path program 52 times [2018-10-23 09:57:29,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:29,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:29,690 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:57:29,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:29,691 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:29,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:31,035 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:31,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:31,035 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:31,035 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:31,036 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:31,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:31,036 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:31,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:57:31,044 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:57:31,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:31,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:31,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:31,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:34,567 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:34,587 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:34,588 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 109 [2018-10-23 09:57:34,588 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:34,588 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-23 09:57:34,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-23 09:57:34,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-23 09:57:34,590 INFO L87 Difference]: Start difference. First operand 170 states and 170 transitions. Second operand 56 states. [2018-10-23 09:57:34,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:34,772 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-23 09:57:34,772 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-23 09:57:34,773 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 169 [2018-10-23 09:57:34,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:34,774 INFO L225 Difference]: With dead ends: 180 [2018-10-23 09:57:34,774 INFO L226 Difference]: Without dead ends: 174 [2018-10-23 09:57:34,775 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5886, Invalid=5886, Unknown=0, NotChecked=0, Total=11772 [2018-10-23 09:57:34,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-10-23 09:57:34,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2018-10-23 09:57:34,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2018-10-23 09:57:34,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 173 transitions. [2018-10-23 09:57:34,778 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 173 transitions. Word has length 169 [2018-10-23 09:57:34,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:34,778 INFO L481 AbstractCegarLoop]: Abstraction has 173 states and 173 transitions. [2018-10-23 09:57:34,779 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-23 09:57:34,779 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 173 transitions. [2018-10-23 09:57:34,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2018-10-23 09:57:34,779 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:34,779 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:34,780 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:34,780 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:34,780 INFO L82 PathProgramCache]: Analyzing trace with hash 804003930, now seen corresponding path program 53 times [2018-10-23 09:57:34,780 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:34,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:34,781 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:57:34,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:34,781 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:34,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:35,994 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:35,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:35,994 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:35,995 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:35,995 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:35,995 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:35,995 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:36,023 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:57:36,023 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:57:36,135 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:57:36,135 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:57:36,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:36,176 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:36,176 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:39,597 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:39,618 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:39,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 111 [2018-10-23 09:57:39,618 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:39,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-23 09:57:39,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-23 09:57:39,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-23 09:57:39,621 INFO L87 Difference]: Start difference. First operand 173 states and 173 transitions. Second operand 57 states. [2018-10-23 09:57:39,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:39,867 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-23 09:57:39,868 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-23 09:57:39,868 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 172 [2018-10-23 09:57:39,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:39,869 INFO L225 Difference]: With dead ends: 183 [2018-10-23 09:57:39,869 INFO L226 Difference]: Without dead ends: 177 [2018-10-23 09:57:39,870 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=6105, Invalid=6105, Unknown=0, NotChecked=0, Total=12210 [2018-10-23 09:57:39,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-23 09:57:39,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 176. [2018-10-23 09:57:39,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-10-23 09:57:39,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 176 transitions. [2018-10-23 09:57:39,874 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 176 transitions. Word has length 172 [2018-10-23 09:57:39,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:39,875 INFO L481 AbstractCegarLoop]: Abstraction has 176 states and 176 transitions. [2018-10-23 09:57:39,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-23 09:57:39,875 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 176 transitions. [2018-10-23 09:57:39,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-10-23 09:57:39,876 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:39,876 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:39,876 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:39,877 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:39,877 INFO L82 PathProgramCache]: Analyzing trace with hash 142221187, now seen corresponding path program 54 times [2018-10-23 09:57:39,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:39,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:39,878 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:57:39,878 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:39,878 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:39,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:41,096 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:41,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:41,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:41,096 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:41,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:41,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:41,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:41,121 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:57:41,121 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:57:41,243 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:57:41,244 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:57:41,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:41,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:41,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:44,817 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:44,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:44,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 113 [2018-10-23 09:57:44,838 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:44,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-23 09:57:44,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-23 09:57:44,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6328, Invalid=6328, Unknown=0, NotChecked=0, Total=12656 [2018-10-23 09:57:44,840 INFO L87 Difference]: Start difference. First operand 176 states and 176 transitions. Second operand 58 states. [2018-10-23 09:57:45,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:45,043 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-23 09:57:45,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-23 09:57:45,044 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 175 [2018-10-23 09:57:45,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:45,045 INFO L225 Difference]: With dead ends: 186 [2018-10-23 09:57:45,045 INFO L226 Difference]: Without dead ends: 180 [2018-10-23 09:57:45,046 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 295 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=6328, Invalid=6328, Unknown=0, NotChecked=0, Total=12656 [2018-10-23 09:57:45,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-10-23 09:57:45,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2018-10-23 09:57:45,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-10-23 09:57:45,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 179 transitions. [2018-10-23 09:57:45,050 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 179 transitions. Word has length 175 [2018-10-23 09:57:45,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:45,050 INFO L481 AbstractCegarLoop]: Abstraction has 179 states and 179 transitions. [2018-10-23 09:57:45,050 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-23 09:57:45,050 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 179 transitions. [2018-10-23 09:57:45,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2018-10-23 09:57:45,051 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:45,051 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:45,052 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:45,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:45,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1127586886, now seen corresponding path program 55 times [2018-10-23 09:57:45,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:45,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:45,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:57:45,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:45,053 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:45,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:46,299 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:46,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:46,300 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:46,300 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:46,300 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:46,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:46,300 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:46,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:57:46,312 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:57:46,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:46,440 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:46,495 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:46,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:50,095 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:50,116 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:50,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 115 [2018-10-23 09:57:50,116 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:50,117 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-23 09:57:50,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-23 09:57:50,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6555, Invalid=6555, Unknown=0, NotChecked=0, Total=13110 [2018-10-23 09:57:50,119 INFO L87 Difference]: Start difference. First operand 179 states and 179 transitions. Second operand 59 states. [2018-10-23 09:57:50,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:50,327 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-23 09:57:50,327 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-23 09:57:50,327 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 178 [2018-10-23 09:57:50,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:50,328 INFO L225 Difference]: With dead ends: 189 [2018-10-23 09:57:50,328 INFO L226 Difference]: Without dead ends: 183 [2018-10-23 09:57:50,330 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 300 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6555, Invalid=6555, Unknown=0, NotChecked=0, Total=13110 [2018-10-23 09:57:50,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-10-23 09:57:50,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 182. [2018-10-23 09:57:50,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-10-23 09:57:50,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 182 transitions. [2018-10-23 09:57:50,334 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 182 transitions. Word has length 178 [2018-10-23 09:57:50,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:50,334 INFO L481 AbstractCegarLoop]: Abstraction has 182 states and 182 transitions. [2018-10-23 09:57:50,334 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-23 09:57:50,334 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 182 transitions. [2018-10-23 09:57:50,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-10-23 09:57:50,335 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:50,335 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:50,335 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:50,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:50,336 INFO L82 PathProgramCache]: Analyzing trace with hash 92053539, now seen corresponding path program 56 times [2018-10-23 09:57:50,336 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:50,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:50,337 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:57:50,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:50,337 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:50,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:51,777 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:51,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:51,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:51,778 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:51,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:51,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:51,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:51,786 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:57:51,786 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:57:51,912 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:57:51,913 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:57:51,917 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:51,989 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:51,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:57:55,817 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:55,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:57:55,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 117 [2018-10-23 09:57:55,838 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:57:55,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-23 09:57:55,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-23 09:57:55,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6786, Invalid=6786, Unknown=0, NotChecked=0, Total=13572 [2018-10-23 09:57:55,840 INFO L87 Difference]: Start difference. First operand 182 states and 182 transitions. Second operand 60 states. [2018-10-23 09:57:56,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:57:56,078 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-23 09:57:56,078 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-23 09:57:56,078 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 181 [2018-10-23 09:57:56,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:57:56,080 INFO L225 Difference]: With dead ends: 192 [2018-10-23 09:57:56,080 INFO L226 Difference]: Without dead ends: 186 [2018-10-23 09:57:56,081 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 305 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=6786, Invalid=6786, Unknown=0, NotChecked=0, Total=13572 [2018-10-23 09:57:56,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-23 09:57:56,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 185. [2018-10-23 09:57:56,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2018-10-23 09:57:56,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 185 transitions. [2018-10-23 09:57:56,085 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 185 transitions. Word has length 181 [2018-10-23 09:57:56,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:57:56,085 INFO L481 AbstractCegarLoop]: Abstraction has 185 states and 185 transitions. [2018-10-23 09:57:56,085 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-23 09:57:56,085 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 185 transitions. [2018-10-23 09:57:56,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-10-23 09:57:56,086 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:57:56,087 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:57:56,087 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:57:56,087 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:57:56,087 INFO L82 PathProgramCache]: Analyzing trace with hash -1023369446, now seen corresponding path program 57 times [2018-10-23 09:57:56,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:57:56,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:56,088 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:57:56,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:57:56,088 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:57:56,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:57:57,447 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:57,447 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:57,448 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:57:57,448 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:57:57,448 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:57:57,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:57:57,448 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:57:57,456 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:57:57,456 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:57:57,581 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:57:57,581 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:57:57,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:57:57,625 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:57:57,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:58:01,433 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:01,454 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:58:01,454 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 119 [2018-10-23 09:58:01,454 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:58:01,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-23 09:58:01,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-23 09:58:01,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7021, Invalid=7021, Unknown=0, NotChecked=0, Total=14042 [2018-10-23 09:58:01,456 INFO L87 Difference]: Start difference. First operand 185 states and 185 transitions. Second operand 61 states. [2018-10-23 09:58:01,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:58:01,740 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-23 09:58:01,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-23 09:58:01,740 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 184 [2018-10-23 09:58:01,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:58:01,741 INFO L225 Difference]: With dead ends: 195 [2018-10-23 09:58:01,741 INFO L226 Difference]: Without dead ends: 189 [2018-10-23 09:58:01,742 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 310 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=7021, Invalid=7021, Unknown=0, NotChecked=0, Total=14042 [2018-10-23 09:58:01,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-10-23 09:58:01,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 188. [2018-10-23 09:58:01,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2018-10-23 09:58:01,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 188 transitions. [2018-10-23 09:58:01,746 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 188 transitions. Word has length 184 [2018-10-23 09:58:01,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:58:01,747 INFO L481 AbstractCegarLoop]: Abstraction has 188 states and 188 transitions. [2018-10-23 09:58:01,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-23 09:58:01,747 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 188 transitions. [2018-10-23 09:58:01,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-10-23 09:58:01,748 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:58:01,748 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:58:01,748 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:58:01,748 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:58:01,749 INFO L82 PathProgramCache]: Analyzing trace with hash -427546429, now seen corresponding path program 58 times [2018-10-23 09:58:01,749 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:58:01,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:01,749 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:58:01,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:01,750 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:58:01,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:03,131 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:03,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:03,131 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:58:03,131 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:58:03,131 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:58:03,131 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:03,132 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:58:03,139 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:58:03,139 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:58:03,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:03,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:58:03,322 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:03,322 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:58:07,457 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:07,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:58:07,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 121 [2018-10-23 09:58:07,478 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:58:07,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-23 09:58:07,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-23 09:58:07,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7260, Invalid=7260, Unknown=0, NotChecked=0, Total=14520 [2018-10-23 09:58:07,480 INFO L87 Difference]: Start difference. First operand 188 states and 188 transitions. Second operand 62 states. [2018-10-23 09:58:07,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:58:07,690 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-23 09:58:07,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-23 09:58:07,691 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 187 [2018-10-23 09:58:07,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:58:07,692 INFO L225 Difference]: With dead ends: 198 [2018-10-23 09:58:07,693 INFO L226 Difference]: Without dead ends: 192 [2018-10-23 09:58:07,694 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 315 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=7260, Invalid=7260, Unknown=0, NotChecked=0, Total=14520 [2018-10-23 09:58:07,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-10-23 09:58:07,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 191. [2018-10-23 09:58:07,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 191 states. [2018-10-23 09:58:07,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 191 transitions. [2018-10-23 09:58:07,698 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 191 transitions. Word has length 187 [2018-10-23 09:58:07,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:58:07,698 INFO L481 AbstractCegarLoop]: Abstraction has 191 states and 191 transitions. [2018-10-23 09:58:07,698 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-23 09:58:07,698 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 191 transitions. [2018-10-23 09:58:07,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2018-10-23 09:58:07,699 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:58:07,700 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:58:07,700 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:58:07,700 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:58:07,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1363881350, now seen corresponding path program 59 times [2018-10-23 09:58:07,700 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:58:07,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:07,701 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:58:07,701 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:07,701 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:58:07,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:09,461 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:09,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:09,461 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:58:09,461 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:58:09,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:58:09,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:09,462 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:58:09,471 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:58:09,471 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:58:09,599 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:58:09,599 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:58:09,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:58:09,639 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:09,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:58:13,443 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:13,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:58:13,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 123 [2018-10-23 09:58:13,464 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:58:13,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-23 09:58:13,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-23 09:58:13,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7503, Invalid=7503, Unknown=0, NotChecked=0, Total=15006 [2018-10-23 09:58:13,467 INFO L87 Difference]: Start difference. First operand 191 states and 191 transitions. Second operand 63 states. [2018-10-23 09:58:13,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:58:13,764 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-23 09:58:13,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-23 09:58:13,765 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 190 [2018-10-23 09:58:13,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:58:13,766 INFO L225 Difference]: With dead ends: 201 [2018-10-23 09:58:13,766 INFO L226 Difference]: Without dead ends: 195 [2018-10-23 09:58:13,767 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 441 GetRequests, 320 SyntacticMatches, 0 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=7503, Invalid=7503, Unknown=0, NotChecked=0, Total=15006 [2018-10-23 09:58:13,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-23 09:58:13,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 194. [2018-10-23 09:58:13,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2018-10-23 09:58:13,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 194 transitions. [2018-10-23 09:58:13,770 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 194 transitions. Word has length 190 [2018-10-23 09:58:13,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:58:13,771 INFO L481 AbstractCegarLoop]: Abstraction has 194 states and 194 transitions. [2018-10-23 09:58:13,771 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-23 09:58:13,771 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 194 transitions. [2018-10-23 09:58:13,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2018-10-23 09:58:13,772 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:58:13,772 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:58:13,772 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:58:13,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:58:13,772 INFO L82 PathProgramCache]: Analyzing trace with hash 95074659, now seen corresponding path program 60 times [2018-10-23 09:58:13,772 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:58:13,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:13,773 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:58:13,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:13,773 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:58:13,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:15,480 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:15,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:15,481 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:58:15,481 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:58:15,481 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:58:15,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:15,481 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:58:15,492 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:58:15,493 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:58:15,620 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:58:15,620 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:58:15,624 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:58:15,666 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:15,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:58:20,112 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:20,133 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:58:20,134 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 125 [2018-10-23 09:58:20,134 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:58:20,134 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-23 09:58:20,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-23 09:58:20,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7750, Invalid=7750, Unknown=0, NotChecked=0, Total=15500 [2018-10-23 09:58:20,135 INFO L87 Difference]: Start difference. First operand 194 states and 194 transitions. Second operand 64 states. [2018-10-23 09:58:21,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:58:21,021 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-23 09:58:21,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-23 09:58:21,021 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 193 [2018-10-23 09:58:21,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:58:21,022 INFO L225 Difference]: With dead ends: 204 [2018-10-23 09:58:21,022 INFO L226 Difference]: Without dead ends: 198 [2018-10-23 09:58:21,023 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 325 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=7750, Invalid=7750, Unknown=0, NotChecked=0, Total=15500 [2018-10-23 09:58:21,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2018-10-23 09:58:21,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2018-10-23 09:58:21,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-10-23 09:58:21,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 197 transitions. [2018-10-23 09:58:21,028 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 197 transitions. Word has length 193 [2018-10-23 09:58:21,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:58:21,028 INFO L481 AbstractCegarLoop]: Abstraction has 197 states and 197 transitions. [2018-10-23 09:58:21,028 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-23 09:58:21,029 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 197 transitions. [2018-10-23 09:58:21,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-10-23 09:58:21,030 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:58:21,030 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:58:21,030 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:58:21,030 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:58:21,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1215496742, now seen corresponding path program 61 times [2018-10-23 09:58:21,031 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:58:21,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:21,031 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:58:21,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:21,031 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:58:21,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:22,517 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:22,517 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:22,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:58:22,518 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:58:22,518 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:58:22,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:22,518 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:58:22,525 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:58:22,525 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:58:22,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:22,661 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:58:22,698 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:22,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:58:27,073 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:27,094 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:58:27,095 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 127 [2018-10-23 09:58:27,095 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:58:27,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-23 09:58:27,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-23 09:58:27,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8001, Invalid=8001, Unknown=0, NotChecked=0, Total=16002 [2018-10-23 09:58:27,097 INFO L87 Difference]: Start difference. First operand 197 states and 197 transitions. Second operand 65 states. [2018-10-23 09:58:27,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:58:27,331 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-23 09:58:27,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-23 09:58:27,331 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 196 [2018-10-23 09:58:27,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:58:27,333 INFO L225 Difference]: With dead ends: 207 [2018-10-23 09:58:27,333 INFO L226 Difference]: Without dead ends: 201 [2018-10-23 09:58:27,335 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 330 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=8001, Invalid=8001, Unknown=0, NotChecked=0, Total=16002 [2018-10-23 09:58:27,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-10-23 09:58:27,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 200. [2018-10-23 09:58:27,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-10-23 09:58:27,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 200 transitions. [2018-10-23 09:58:27,339 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 200 transitions. Word has length 196 [2018-10-23 09:58:27,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:58:27,339 INFO L481 AbstractCegarLoop]: Abstraction has 200 states and 200 transitions. [2018-10-23 09:58:27,339 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-23 09:58:27,340 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 200 transitions. [2018-10-23 09:58:27,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2018-10-23 09:58:27,341 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:58:27,341 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:58:27,341 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:58:27,341 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:58:27,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1099584003, now seen corresponding path program 62 times [2018-10-23 09:58:27,342 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:58:27,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:27,342 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:58:27,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:27,343 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:58:27,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:29,096 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:29,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:29,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:58:29,096 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:58:29,096 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:58:29,096 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:29,096 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:58:29,106 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:58:29,106 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:58:29,236 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:58:29,236 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:58:29,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:58:29,282 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:29,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:58:34,707 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:34,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:58:34,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 129 [2018-10-23 09:58:34,728 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:58:34,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-23 09:58:34,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-23 09:58:34,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8256, Invalid=8256, Unknown=0, NotChecked=0, Total=16512 [2018-10-23 09:58:34,731 INFO L87 Difference]: Start difference. First operand 200 states and 200 transitions. Second operand 66 states. [2018-10-23 09:58:35,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:58:35,041 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-23 09:58:35,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-23 09:58:35,041 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 199 [2018-10-23 09:58:35,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:58:35,042 INFO L225 Difference]: With dead ends: 210 [2018-10-23 09:58:35,042 INFO L226 Difference]: Without dead ends: 204 [2018-10-23 09:58:35,043 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=8256, Invalid=8256, Unknown=0, NotChecked=0, Total=16512 [2018-10-23 09:58:35,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-10-23 09:58:35,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 203. [2018-10-23 09:58:35,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-10-23 09:58:35,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 203 transitions. [2018-10-23 09:58:35,047 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 203 transitions. Word has length 199 [2018-10-23 09:58:35,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:58:35,047 INFO L481 AbstractCegarLoop]: Abstraction has 203 states and 203 transitions. [2018-10-23 09:58:35,047 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-23 09:58:35,047 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 203 transitions. [2018-10-23 09:58:35,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-10-23 09:58:35,048 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:58:35,049 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:58:35,049 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:58:35,049 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:58:35,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1085219130, now seen corresponding path program 63 times [2018-10-23 09:58:35,049 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:58:35,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:35,050 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:58:35,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:35,050 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:58:35,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:36,694 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:36,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:36,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:58:36,695 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:58:36,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:58:36,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:36,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:58:36,703 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:58:36,703 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:58:36,844 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:58:36,845 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:58:36,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:58:36,891 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:36,891 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:58:41,629 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:41,649 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:58:41,650 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 131 [2018-10-23 09:58:41,650 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:58:41,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-23 09:58:41,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-23 09:58:41,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8515, Invalid=8515, Unknown=0, NotChecked=0, Total=17030 [2018-10-23 09:58:41,652 INFO L87 Difference]: Start difference. First operand 203 states and 203 transitions. Second operand 67 states. [2018-10-23 09:58:41,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:58:41,901 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-23 09:58:41,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-23 09:58:41,901 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 202 [2018-10-23 09:58:41,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:58:41,903 INFO L225 Difference]: With dead ends: 213 [2018-10-23 09:58:41,903 INFO L226 Difference]: Without dead ends: 207 [2018-10-23 09:58:41,904 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 340 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=8515, Invalid=8515, Unknown=0, NotChecked=0, Total=17030 [2018-10-23 09:58:41,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-23 09:58:41,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2018-10-23 09:58:41,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2018-10-23 09:58:41,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 206 transitions. [2018-10-23 09:58:41,908 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 206 transitions. Word has length 202 [2018-10-23 09:58:41,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:58:41,908 INFO L481 AbstractCegarLoop]: Abstraction has 206 states and 206 transitions. [2018-10-23 09:58:41,908 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-23 09:58:41,908 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 206 transitions. [2018-10-23 09:58:41,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-10-23 09:58:41,909 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:58:41,909 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:58:41,909 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:58:41,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:58:41,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1656950109, now seen corresponding path program 64 times [2018-10-23 09:58:41,910 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:58:41,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:41,910 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:58:41,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:41,910 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:58:41,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:43,512 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:43,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:43,512 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:58:43,512 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:58:43,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:58:43,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:43,513 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:58:43,521 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:58:43,521 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:58:43,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:43,661 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:58:43,705 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:43,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:58:48,496 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:48,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:58:48,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 133 [2018-10-23 09:58:48,518 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:58:48,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-23 09:58:48,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-23 09:58:48,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8778, Invalid=8778, Unknown=0, NotChecked=0, Total=17556 [2018-10-23 09:58:48,520 INFO L87 Difference]: Start difference. First operand 206 states and 206 transitions. Second operand 68 states. [2018-10-23 09:58:48,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:58:48,774 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-23 09:58:48,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-23 09:58:48,775 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 205 [2018-10-23 09:58:48,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:58:48,777 INFO L225 Difference]: With dead ends: 216 [2018-10-23 09:58:48,777 INFO L226 Difference]: Without dead ends: 210 [2018-10-23 09:58:48,778 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=8778, Invalid=8778, Unknown=0, NotChecked=0, Total=17556 [2018-10-23 09:58:48,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2018-10-23 09:58:48,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 209. [2018-10-23 09:58:48,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-10-23 09:58:48,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 209 transitions. [2018-10-23 09:58:48,782 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 209 transitions. Word has length 205 [2018-10-23 09:58:48,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:58:48,782 INFO L481 AbstractCegarLoop]: Abstraction has 209 states and 209 transitions. [2018-10-23 09:58:48,782 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-23 09:58:48,782 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 209 transitions. [2018-10-23 09:58:48,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2018-10-23 09:58:48,783 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:58:48,783 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:58:48,783 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:58:48,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:58:48,784 INFO L82 PathProgramCache]: Analyzing trace with hash 952188058, now seen corresponding path program 65 times [2018-10-23 09:58:48,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:58:48,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:48,784 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:58:48,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:48,785 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:58:48,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:50,677 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:50,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:50,677 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:58:50,677 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:58:50,677 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:58:50,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:50,678 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:58:50,686 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:58:50,687 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:58:50,828 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:58:50,828 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:58:50,833 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:58:50,877 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:50,877 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:58:55,817 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:55,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:58:55,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 135 [2018-10-23 09:58:55,839 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:58:55,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-23 09:58:55,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-23 09:58:55,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9045, Invalid=9045, Unknown=0, NotChecked=0, Total=18090 [2018-10-23 09:58:55,840 INFO L87 Difference]: Start difference. First operand 209 states and 209 transitions. Second operand 69 states. [2018-10-23 09:58:56,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:58:56,086 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-10-23 09:58:56,086 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-23 09:58:56,086 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 208 [2018-10-23 09:58:56,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:58:56,087 INFO L225 Difference]: With dead ends: 219 [2018-10-23 09:58:56,088 INFO L226 Difference]: Without dead ends: 213 [2018-10-23 09:58:56,088 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 350 SyntacticMatches, 0 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=9045, Invalid=9045, Unknown=0, NotChecked=0, Total=18090 [2018-10-23 09:58:56,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2018-10-23 09:58:56,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 212. [2018-10-23 09:58:56,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2018-10-23 09:58:56,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 212 transitions. [2018-10-23 09:58:56,092 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 212 transitions. Word has length 208 [2018-10-23 09:58:56,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:58:56,093 INFO L481 AbstractCegarLoop]: Abstraction has 212 states and 212 transitions. [2018-10-23 09:58:56,093 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-23 09:58:56,093 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 212 transitions. [2018-10-23 09:58:56,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2018-10-23 09:58:56,094 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:58:56,094 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:58:56,094 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:58:56,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:58:56,095 INFO L82 PathProgramCache]: Analyzing trace with hash -530801853, now seen corresponding path program 66 times [2018-10-23 09:58:56,095 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:58:56,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:56,096 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:58:56,096 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:58:56,096 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:58:56,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:58:57,847 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:57,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:57,848 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:58:57,848 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:58:57,848 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:58:57,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:58:57,848 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:58:57,856 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:58:57,856 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 09:58:58,007 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:58:58,007 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:58:58,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:58:58,055 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:58:58,055 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:59:03,178 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:59:03,199 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:59:03,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 137 [2018-10-23 09:59:03,200 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:59:03,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-23 09:59:03,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-23 09:59:03,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9316, Invalid=9316, Unknown=0, NotChecked=0, Total=18632 [2018-10-23 09:59:03,202 INFO L87 Difference]: Start difference. First operand 212 states and 212 transitions. Second operand 70 states. [2018-10-23 09:59:04,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:59:04,202 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-10-23 09:59:04,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-23 09:59:04,202 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 211 [2018-10-23 09:59:04,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:59:04,204 INFO L225 Difference]: With dead ends: 222 [2018-10-23 09:59:04,204 INFO L226 Difference]: Without dead ends: 216 [2018-10-23 09:59:04,205 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 355 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=9316, Invalid=9316, Unknown=0, NotChecked=0, Total=18632 [2018-10-23 09:59:04,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2018-10-23 09:59:04,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 215. [2018-10-23 09:59:04,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-10-23 09:59:04,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 215 transitions. [2018-10-23 09:59:04,209 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 215 transitions. Word has length 211 [2018-10-23 09:59:04,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:59:04,210 INFO L481 AbstractCegarLoop]: Abstraction has 215 states and 215 transitions. [2018-10-23 09:59:04,210 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-23 09:59:04,210 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 215 transitions. [2018-10-23 09:59:04,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-10-23 09:59:04,211 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:59:04,212 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:59:04,212 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:59:04,212 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:59:04,212 INFO L82 PathProgramCache]: Analyzing trace with hash 2045333498, now seen corresponding path program 67 times [2018-10-23 09:59:04,212 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:59:04,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:59:04,213 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:59:04,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:59:04,213 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:59:04,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:59:07,422 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:59:07,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:59:07,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:59:07,423 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:59:07,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:59:07,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:59:07,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:59:07,431 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:59:07,432 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 09:59:07,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:59:07,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:59:07,626 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:59:07,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:59:12,855 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:59:12,875 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:59:12,876 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 139 [2018-10-23 09:59:12,876 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:59:12,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-23 09:59:12,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-23 09:59:12,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9591, Invalid=9591, Unknown=0, NotChecked=0, Total=19182 [2018-10-23 09:59:12,878 INFO L87 Difference]: Start difference. First operand 215 states and 215 transitions. Second operand 71 states. [2018-10-23 09:59:13,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:59:13,289 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2018-10-23 09:59:13,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-23 09:59:13,290 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 214 [2018-10-23 09:59:13,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:59:13,291 INFO L225 Difference]: With dead ends: 225 [2018-10-23 09:59:13,291 INFO L226 Difference]: Without dead ends: 219 [2018-10-23 09:59:13,292 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 360 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=9591, Invalid=9591, Unknown=0, NotChecked=0, Total=19182 [2018-10-23 09:59:13,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-23 09:59:13,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 218. [2018-10-23 09:59:13,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2018-10-23 09:59:13,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 218 transitions. [2018-10-23 09:59:13,296 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 218 transitions. Word has length 214 [2018-10-23 09:59:13,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:59:13,296 INFO L481 AbstractCegarLoop]: Abstraction has 218 states and 218 transitions. [2018-10-23 09:59:13,296 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-23 09:59:13,296 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 218 transitions. [2018-10-23 09:59:13,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2018-10-23 09:59:13,297 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:59:13,297 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:59:13,297 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:59:13,298 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:59:13,298 INFO L82 PathProgramCache]: Analyzing trace with hash 922962915, now seen corresponding path program 68 times [2018-10-23 09:59:13,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:59:13,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:59:13,298 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 09:59:13,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:59:13,298 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:59:13,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:59:15,212 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:59:15,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:59:15,213 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:59:15,213 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:59:15,213 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:59:15,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:59:15,213 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:59:15,222 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 09:59:15,223 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 09:59:15,367 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 09:59:15,368 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:59:15,372 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:59:15,422 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:59:15,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 09:59:20,841 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:59:20,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 09:59:20,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 141 [2018-10-23 09:59:20,862 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 09:59:20,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-23 09:59:20,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-23 09:59:20,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9870, Invalid=9870, Unknown=0, NotChecked=0, Total=19740 [2018-10-23 09:59:20,864 INFO L87 Difference]: Start difference. First operand 218 states and 218 transitions. Second operand 72 states. [2018-10-23 09:59:21,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 09:59:21,207 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2018-10-23 09:59:21,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-23 09:59:21,207 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 217 [2018-10-23 09:59:21,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 09:59:21,208 INFO L225 Difference]: With dead ends: 228 [2018-10-23 09:59:21,208 INFO L226 Difference]: Without dead ends: 222 [2018-10-23 09:59:21,209 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 365 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=9870, Invalid=9870, Unknown=0, NotChecked=0, Total=19740 [2018-10-23 09:59:21,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-23 09:59:21,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 221. [2018-10-23 09:59:21,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2018-10-23 09:59:21,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 221 transitions. [2018-10-23 09:59:21,212 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 221 transitions. Word has length 217 [2018-10-23 09:59:21,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 09:59:21,212 INFO L481 AbstractCegarLoop]: Abstraction has 221 states and 221 transitions. [2018-10-23 09:59:21,213 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-23 09:59:21,213 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 221 transitions. [2018-10-23 09:59:21,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2018-10-23 09:59:21,214 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 09:59:21,214 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 09:59:21,214 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 09:59:21,214 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 09:59:21,214 INFO L82 PathProgramCache]: Analyzing trace with hash 701324122, now seen corresponding path program 69 times [2018-10-23 09:59:21,214 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 09:59:21,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:59:21,215 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 09:59:21,215 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 09:59:21,215 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 09:59:21,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 09:59:23,185 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 09:59:23,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:59:23,185 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 09:59:23,185 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 09:59:23,185 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 09:59:23,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 09:59:23,186 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-23 09:59:23,193 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 09:59:23,193 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Received shutdown request... [2018-10-23 09:59:23,372 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 09:59:23,372 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 09:59:23,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 09:59:23,380 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-23 09:59:23,581 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 09:59:23,582 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-23 09:59:23,587 WARN L205 ceAbstractionStarter]: Timeout [2018-10-23 09:59:23,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 09:59:23 BoogieIcfgContainer [2018-10-23 09:59:23,588 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-23 09:59:23,589 INFO L168 Benchmark]: Toolchain (without parser) took 232516.53 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 830.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -799.0 MB). Peak memory consumption was 31.5 MB. Max. memory is 7.1 GB. [2018-10-23 09:59:23,590 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 09:59:23,590 INFO L168 Benchmark]: CACSL2BoogieTranslator took 324.85 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-23 09:59:23,591 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.19 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 09:59:23,591 INFO L168 Benchmark]: Boogie Preprocessor took 24.57 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 09:59:23,591 INFO L168 Benchmark]: RCFGBuilder took 492.33 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 721.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -763.7 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-10-23 09:59:23,592 INFO L168 Benchmark]: TraceAbstraction took 231632.98 ms. Allocated memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: 108.5 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -45.8 MB). Peak memory consumption was 62.7 MB. Max. memory is 7.1 GB. [2018-10-23 09:59:23,594 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 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. * CACSL2BoogieTranslator took 324.85 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 37.19 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 24.57 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 492.33 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 721.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -763.7 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 231632.98 ms. Allocated memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: 108.5 MB). Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -45.8 MB). Peak memory consumption was 62.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was analyzing trace of length 221 with TraceHistMax 70,while TraceCheckSpWp was constructing forward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 72 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. TIMEOUT Result, 231.5s OverallTime, 71 OverallIterations, 70 TraceHistogramMax, 14.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 919 SDtfs, 2415 SDslu, 19022 SDs, 0 SdLazy, 6680 SolverSat, 103 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 10.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18331 GetRequests, 13434 SyntacticMatches, 0 SemanticMatches, 4897 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9384 ImplicationChecksByTransitivity, 196.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=221occurred in iteration=70, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.6s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 70 MinimizatonAttempts, 69 StatesRemovedByMinimization, 69 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.4s SsaConstructionTime, 6.1s SatisfiabilityAnalysisTime, 202.6s InterpolantComputationTime, 15869 NumberOfCodeBlocks, 15869 NumberOfCodeBlocksAsserted, 183 NumberOfCheckSat, 23585 ConstructedInterpolants, 0 QuantifiedInterpolants, 9815263 SizeOfPredicates, 68 NumberOfNonLiveVariables, 37264 ConjunctsInSsa, 2482 ConjunctsInUnsatCore, 206 InterpolantComputations, 2 PerfectInterpolantSequences, 0/485622 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown