java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 04:59:34,528 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 04:59:34,530 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 04:59:34,544 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 04:59:34,544 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 04:59:34,545 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 04:59:34,546 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 04:59:34,548 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 04:59:34,550 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 04:59:34,550 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 04:59:34,551 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 04:59:34,552 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 04:59:34,552 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 04:59:34,553 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 04:59:34,557 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 04:59:34,558 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 04:59:34,559 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 04:59:34,562 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 04:59:34,569 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 04:59:34,571 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 04:59:34,574 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 04:59:34,575 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 04:59:34,577 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 04:59:34,577 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 04:59:34,578 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 04:59:34,578 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 04:59:34,579 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 04:59:34,580 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 04:59:34,580 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 04:59:34,581 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 04:59:34,582 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 04:59:34,582 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 04:59:34,582 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 04:59:34,583 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 04:59:34,584 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 04:59:34,584 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 04:59:34,585 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-11-07 04:59:34,599 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 04:59:34,600 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 04:59:34,600 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 04:59:34,601 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 04:59:34,601 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 04:59:34,601 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 04:59:34,601 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 04:59:34,601 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 04:59:34,602 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 04:59:34,602 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 04:59:34,602 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 04:59:34,602 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-07 04:59:34,603 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 04:59:34,603 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 04:59:34,603 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 04:59:34,603 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 04:59:34,603 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 04:59:34,604 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 04:59:34,604 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 04:59:34,604 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 04:59:34,604 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 04:59:34,604 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 04:59:34,605 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 04:59:34,605 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 04:59:34,605 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 04:59:34,605 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 04:59:34,605 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 04:59:34,606 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 04:59:34,606 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 04:59:34,606 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 04:59:34,606 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 04:59:34,606 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 04:59:34,607 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 04:59:34,607 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 04:59:34,649 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 04:59:34,662 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 04:59:34,666 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 04:59:34,667 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 04:59:34,668 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 04:59:34,668 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i [2018-11-07 04:59:34,728 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/219498238/ac53b5c783634c59a11ff3d20430d937/FLAG5c5f95ce2 [2018-11-07 04:59:35,183 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 04:59:35,183 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_false-unreach-call1.i [2018-11-07 04:59:35,194 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/219498238/ac53b5c783634c59a11ff3d20430d937/FLAG5c5f95ce2 [2018-11-07 04:59:35,209 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/219498238/ac53b5c783634c59a11ff3d20430d937 [2018-11-07 04:59:35,218 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 04:59:35,220 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 04:59:35,221 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 04:59:35,221 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 04:59:35,224 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 04:59:35,225 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,228 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ede70b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35, skipping insertion in model container [2018-11-07 04:59:35,228 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,239 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 04:59:35,265 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 04:59:35,465 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 04:59:35,469 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 04:59:35,487 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 04:59:35,504 INFO L193 MainTranslator]: Completed translation [2018-11-07 04:59:35,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35 WrapperNode [2018-11-07 04:59:35,505 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 04:59:35,506 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 04:59:35,506 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 04:59:35,506 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 04:59:35,515 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,520 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,526 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 04:59:35,526 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 04:59:35,526 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 04:59:35,527 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 04:59:35,535 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,536 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,536 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,539 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,544 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,544 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... [2018-11-07 04:59:35,546 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 04:59:35,546 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 04:59:35,546 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 04:59:35,547 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 04:59:35,547 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 04:59:35,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 04:59:35,686 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 04:59:35,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 04:59:35,686 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 04:59:35,687 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 04:59:35,687 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 04:59:35,687 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 04:59:35,687 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 04:59:35,898 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 04:59:35,899 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:59:35 BoogieIcfgContainer [2018-11-07 04:59:35,899 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 04:59:35,900 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 04:59:35,900 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 04:59:35,903 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 04:59:35,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:59:35" (1/3) ... [2018-11-07 04:59:35,904 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ed541cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:59:35, skipping insertion in model container [2018-11-07 04:59:35,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:59:35" (2/3) ... [2018-11-07 04:59:35,905 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ed541cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:59:35, skipping insertion in model container [2018-11-07 04:59:35,905 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:59:35" (3/3) ... [2018-11-07 04:59:35,906 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_false-unreach-call1.i [2018-11-07 04:59:35,917 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 04:59:35,923 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 04:59:35,937 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 04:59:35,965 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 04:59:35,965 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 04:59:35,965 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 04:59:35,965 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 04:59:35,965 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 04:59:35,966 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 04:59:35,966 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 04:59:35,966 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 04:59:35,984 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-07 04:59:35,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 04:59:35,990 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:35,991 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:35,994 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:36,000 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:36,000 INFO L82 PathProgramCache]: Analyzing trace with hash -283544510, now seen corresponding path program 1 times [2018-11-07 04:59:36,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:36,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,055 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:36,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,056 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:36,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:36,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:36,108 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 04:59:36,108 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 04:59:36,109 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 04:59:36,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 04:59:36,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 04:59:36,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 04:59:36,128 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-07 04:59:36,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:36,149 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2018-11-07 04:59:36,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 04:59:36,151 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 04:59:36,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:36,160 INFO L225 Difference]: With dead ends: 37 [2018-11-07 04:59:36,160 INFO L226 Difference]: Without dead ends: 15 [2018-11-07 04:59:36,164 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 04:59:36,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-11-07 04:59:36,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-11-07 04:59:36,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-11-07 04:59:36,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-11-07 04:59:36,205 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-11-07 04:59:36,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:36,206 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-11-07 04:59:36,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 04:59:36,206 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-11-07 04:59:36,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 04:59:36,207 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:36,207 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:36,207 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:36,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:36,208 INFO L82 PathProgramCache]: Analyzing trace with hash -863512858, now seen corresponding path program 1 times [2018-11-07 04:59:36,208 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:36,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,209 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:36,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,210 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:36,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:36,387 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:36,388 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 04:59:36,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 04:59:36,388 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 04:59:36,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 04:59:36,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 04:59:36,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 04:59:36,391 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 3 states. [2018-11-07 04:59:36,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:36,468 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2018-11-07 04:59:36,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 04:59:36,469 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 04:59:36,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:36,470 INFO L225 Difference]: With dead ends: 25 [2018-11-07 04:59:36,470 INFO L226 Difference]: Without dead ends: 20 [2018-11-07 04:59:36,471 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 04:59:36,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-11-07 04:59:36,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2018-11-07 04:59:36,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-07 04:59:36,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-11-07 04:59:36,477 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-11-07 04:59:36,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:36,478 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-11-07 04:59:36,478 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 04:59:36,478 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-11-07 04:59:36,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-07 04:59:36,479 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:36,479 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:36,480 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:36,480 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:36,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1427803270, now seen corresponding path program 1 times [2018-11-07 04:59:36,480 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:36,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:36,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,483 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:36,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:36,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:36,623 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 04:59:36,623 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 04:59:36,624 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 04:59:36,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 04:59:36,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 04:59:36,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 04:59:36,625 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 3 states. [2018-11-07 04:59:36,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:36,691 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-11-07 04:59:36,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 04:59:36,692 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-11-07 04:59:36,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:36,693 INFO L225 Difference]: With dead ends: 29 [2018-11-07 04:59:36,693 INFO L226 Difference]: Without dead ends: 19 [2018-11-07 04:59:36,694 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 04:59:36,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-07 04:59:36,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-11-07 04:59:36,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-07 04:59:36,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-11-07 04:59:36,705 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2018-11-07 04:59:36,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:36,708 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-11-07 04:59:36,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 04:59:36,708 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-11-07 04:59:36,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-07 04:59:36,709 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:36,709 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:36,710 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:36,710 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:36,710 INFO L82 PathProgramCache]: Analyzing trace with hash 1523179828, now seen corresponding path program 1 times [2018-11-07 04:59:36,710 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:36,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,712 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:36,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:36,712 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:36,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:36,923 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:36,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:36,924 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:36,925 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-11-07 04:59:36,927 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [24], [28], [34], [37], [39], [45], [46], [47], [49] [2018-11-07 04:59:36,974 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-07 04:59:36,974 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 04:59:37,078 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 04:59:37,856 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 04:59:37,857 INFO L272 AbstractInterpreter]: Visited 16 different actions 252 times. Merged at 7 different actions 135 times. Widened at 3 different actions 38 times. Found 26 fixpoints after 4 different actions. Largest state had 4 variables. [2018-11-07 04:59:37,913 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:37,915 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 04:59:37,915 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:37,915 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:37,934 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:37,935 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:37,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:37,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:38,166 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 04:59:38,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:38,381 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 04:59:38,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:38,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 4] total 9 [2018-11-07 04:59:38,416 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:38,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 04:59:38,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 04:59:38,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2018-11-07 04:59:38,419 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 7 states. [2018-11-07 04:59:38,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:38,729 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2018-11-07 04:59:38,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 04:59:38,731 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-11-07 04:59:38,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:38,732 INFO L225 Difference]: With dead ends: 49 [2018-11-07 04:59:38,732 INFO L226 Difference]: Without dead ends: 37 [2018-11-07 04:59:38,733 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2018-11-07 04:59:38,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-07 04:59:38,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2018-11-07 04:59:38,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-07 04:59:38,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-11-07 04:59:38,741 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 18 [2018-11-07 04:59:38,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:38,742 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-11-07 04:59:38,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 04:59:38,742 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-11-07 04:59:38,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 04:59:38,743 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:38,743 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:38,744 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:38,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:38,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1070919706, now seen corresponding path program 2 times [2018-11-07 04:59:38,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:38,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:38,746 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:38,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:38,746 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:38,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:38,879 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 04:59:38,879 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:38,879 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:38,880 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:38,880 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:38,880 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:38,880 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:38,901 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:38,901 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:38,944 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 04:59:38,944 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:38,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:39,109 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 04:59:39,109 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:39,194 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-07 04:59:39,224 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:39,224 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2018-11-07 04:59:39,224 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:39,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 04:59:39,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 04:59:39,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2018-11-07 04:59:39,226 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 8 states. [2018-11-07 04:59:39,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:39,899 INFO L93 Difference]: Finished difference Result 71 states and 81 transitions. [2018-11-07 04:59:39,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 04:59:39,901 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2018-11-07 04:59:39,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:39,902 INFO L225 Difference]: With dead ends: 71 [2018-11-07 04:59:39,903 INFO L226 Difference]: Without dead ends: 54 [2018-11-07 04:59:39,904 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-11-07 04:59:39,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-07 04:59:39,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2018-11-07 04:59:39,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-07 04:59:39,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-11-07 04:59:39,914 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 29 [2018-11-07 04:59:39,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:39,914 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-11-07 04:59:39,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 04:59:39,915 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-11-07 04:59:39,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 04:59:39,916 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:39,916 INFO L375 BasicCegarLoop]: trace histogram [12, 9, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:39,916 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:39,917 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:39,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1068904040, now seen corresponding path program 3 times [2018-11-07 04:59:39,917 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:39,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:39,918 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:39,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:39,919 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:39,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:40,053 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-11-07 04:59:40,054 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:40,054 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:40,054 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:40,054 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:40,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:40,055 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:40,069 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:40,070 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:40,096 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:40,096 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:40,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:40,299 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 123 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-11-07 04:59:40,299 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:40,462 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 111 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 04:59:40,482 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:40,482 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 6] total 17 [2018-11-07 04:59:40,483 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:40,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 04:59:40,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 04:59:40,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2018-11-07 04:59:40,484 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 13 states. [2018-11-07 04:59:41,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:41,172 INFO L93 Difference]: Finished difference Result 105 states and 118 transitions. [2018-11-07 04:59:41,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 04:59:41,175 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 44 [2018-11-07 04:59:41,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:41,176 INFO L225 Difference]: With dead ends: 105 [2018-11-07 04:59:41,176 INFO L226 Difference]: Without dead ends: 75 [2018-11-07 04:59:41,180 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=169, Invalid=701, Unknown=0, NotChecked=0, Total=870 [2018-11-07 04:59:41,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-11-07 04:59:41,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 64. [2018-11-07 04:59:41,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-11-07 04:59:41,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2018-11-07 04:59:41,201 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 44 [2018-11-07 04:59:41,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:41,202 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2018-11-07 04:59:41,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 04:59:41,202 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2018-11-07 04:59:41,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-11-07 04:59:41,205 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:41,206 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:41,206 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:41,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:41,206 INFO L82 PathProgramCache]: Analyzing trace with hash 46746086, now seen corresponding path program 4 times [2018-11-07 04:59:41,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:41,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:41,208 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:41,208 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:41,208 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:41,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:41,556 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 326 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-11-07 04:59:41,556 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:41,556 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:41,556 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:41,557 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:41,557 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:41,557 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:41,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:41,567 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:41,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:41,595 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:41,705 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 346 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-11-07 04:59:41,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:41,876 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 326 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-11-07 04:59:41,897 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:41,897 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 7] total 16 [2018-11-07 04:59:41,897 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:41,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 04:59:41,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 04:59:41,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 04:59:41,900 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand 11 states. [2018-11-07 04:59:42,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:42,318 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2018-11-07 04:59:42,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 04:59:42,319 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 63 [2018-11-07 04:59:42,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:42,321 INFO L225 Difference]: With dead ends: 93 [2018-11-07 04:59:42,321 INFO L226 Difference]: Without dead ends: 88 [2018-11-07 04:59:42,322 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-11-07 04:59:42,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-11-07 04:59:42,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 77. [2018-11-07 04:59:42,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-11-07 04:59:42,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-11-07 04:59:42,334 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 63 [2018-11-07 04:59:42,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:42,335 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-11-07 04:59:42,335 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 04:59:42,335 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-11-07 04:59:42,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-11-07 04:59:42,337 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:42,338 INFO L375 BasicCegarLoop]: trace histogram [25, 20, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:42,338 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:42,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:42,338 INFO L82 PathProgramCache]: Analyzing trace with hash -742133662, now seen corresponding path program 5 times [2018-11-07 04:59:42,339 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:42,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:42,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:42,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:42,340 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:42,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:42,683 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 0 proven. 540 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2018-11-07 04:59:42,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:42,683 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:42,684 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:42,684 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:42,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:42,684 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:42,696 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:42,696 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:42,767 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 04:59:42,767 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:42,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:42,925 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 214 proven. 20 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2018-11-07 04:59:42,926 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:43,095 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 214 proven. 20 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2018-11-07 04:59:43,116 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:43,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 18 [2018-11-07 04:59:43,116 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:43,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 04:59:43,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 04:59:43,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2018-11-07 04:59:43,117 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-11-07 04:59:44,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:44,254 INFO L93 Difference]: Finished difference Result 175 states and 194 transitions. [2018-11-07 04:59:44,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 04:59:44,256 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 76 [2018-11-07 04:59:44,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:44,258 INFO L225 Difference]: With dead ends: 175 [2018-11-07 04:59:44,258 INFO L226 Difference]: Without dead ends: 115 [2018-11-07 04:59:44,262 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 143 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=328, Invalid=1928, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 04:59:44,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-11-07 04:59:44,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 102. [2018-11-07 04:59:44,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-11-07 04:59:44,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 108 transitions. [2018-11-07 04:59:44,279 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 108 transitions. Word has length 76 [2018-11-07 04:59:44,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:44,279 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 108 transitions. [2018-11-07 04:59:44,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 04:59:44,279 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 108 transitions. [2018-11-07 04:59:44,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-11-07 04:59:44,281 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:44,282 INFO L375 BasicCegarLoop]: trace histogram [36, 30, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:44,282 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:44,282 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:44,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1798689114, now seen corresponding path program 6 times [2018-11-07 04:59:44,283 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:44,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:44,284 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:44,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:44,284 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:44,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:44,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1317 backedges. 0 proven. 1137 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-11-07 04:59:44,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:44,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:44,563 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:44,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:44,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:44,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:44,572 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:44,572 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:44,606 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:44,607 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:44,611 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:44,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1317 backedges. 676 proven. 30 refuted. 0 times theorem prover too weak. 611 trivial. 0 not checked. [2018-11-07 04:59:44,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:44,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1317 backedges. 676 proven. 30 refuted. 0 times theorem prover too weak. 611 trivial. 0 not checked. [2018-11-07 04:59:44,975 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:44,975 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 21 [2018-11-07 04:59:44,976 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:44,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 04:59:44,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 04:59:44,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2018-11-07 04:59:44,977 INFO L87 Difference]: Start difference. First operand 102 states and 108 transitions. Second operand 15 states. [2018-11-07 04:59:46,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:46,351 INFO L93 Difference]: Finished difference Result 229 states and 251 transitions. [2018-11-07 04:59:46,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-07 04:59:46,359 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 101 [2018-11-07 04:59:46,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:46,361 INFO L225 Difference]: With dead ends: 229 [2018-11-07 04:59:46,361 INFO L226 Difference]: Without dead ends: 146 [2018-11-07 04:59:46,363 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 191 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 866 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=487, Invalid=3419, Unknown=0, NotChecked=0, Total=3906 [2018-11-07 04:59:46,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-11-07 04:59:46,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 131. [2018-11-07 04:59:46,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-11-07 04:59:46,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 138 transitions. [2018-11-07 04:59:46,381 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 138 transitions. Word has length 101 [2018-11-07 04:59:46,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:46,382 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 138 transitions. [2018-11-07 04:59:46,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 04:59:46,382 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 138 transitions. [2018-11-07 04:59:46,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-11-07 04:59:46,384 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:46,384 INFO L375 BasicCegarLoop]: trace histogram [49, 42, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:46,384 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:46,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:46,385 INFO L82 PathProgramCache]: Analyzing trace with hash 778877526, now seen corresponding path program 7 times [2018-11-07 04:59:46,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:46,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:46,386 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:46,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:46,386 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:46,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:46,853 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 0 proven. 2135 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-11-07 04:59:46,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:46,854 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:46,854 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:46,854 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:46,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:46,854 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:46,868 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:46,868 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 04:59:46,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:46,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:47,049 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 602 proven. 42 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2018-11-07 04:59:47,049 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:47,245 INFO L134 CoverageAnalysis]: Checked inductivity of 2429 backedges. 602 proven. 42 refuted. 0 times theorem prover too weak. 1785 trivial. 0 not checked. [2018-11-07 04:59:47,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:47,266 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 24 [2018-11-07 04:59:47,266 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:47,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 04:59:47,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 04:59:47,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2018-11-07 04:59:47,268 INFO L87 Difference]: Start difference. First operand 131 states and 138 transitions. Second operand 17 states. [2018-11-07 04:59:49,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:49,980 INFO L93 Difference]: Finished difference Result 291 states and 316 transitions. [2018-11-07 04:59:49,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-11-07 04:59:49,980 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 130 [2018-11-07 04:59:49,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:49,981 INFO L225 Difference]: With dead ends: 291 [2018-11-07 04:59:49,981 INFO L226 Difference]: Without dead ends: 181 [2018-11-07 04:59:49,985 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 248 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1555 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=656, Invalid=5664, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 04:59:49,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-11-07 04:59:50,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 164. [2018-11-07 04:59:50,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-11-07 04:59:50,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 172 transitions. [2018-11-07 04:59:50,005 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 172 transitions. Word has length 130 [2018-11-07 04:59:50,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:50,005 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 172 transitions. [2018-11-07 04:59:50,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 04:59:50,005 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 172 transitions. [2018-11-07 04:59:50,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-11-07 04:59:50,008 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:50,008 INFO L375 BasicCegarLoop]: trace histogram [64, 56, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:50,008 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:50,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:50,009 INFO L82 PathProgramCache]: Analyzing trace with hash 402761190, now seen corresponding path program 8 times [2018-11-07 04:59:50,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:50,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:50,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 04:59:50,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:50,010 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:50,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:50,667 INFO L134 CoverageAnalysis]: Checked inductivity of 4132 backedges. 0 proven. 3684 refuted. 0 times theorem prover too weak. 448 trivial. 0 not checked. [2018-11-07 04:59:50,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:50,668 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:50,668 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:50,668 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:50,668 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:50,669 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:50,679 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 04:59:50,679 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 04:59:50,866 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 04:59:50,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:50,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:51,133 INFO L134 CoverageAnalysis]: Checked inductivity of 4132 backedges. 919 proven. 56 refuted. 0 times theorem prover too weak. 3157 trivial. 0 not checked. [2018-11-07 04:59:51,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:51,963 INFO L134 CoverageAnalysis]: Checked inductivity of 4132 backedges. 919 proven. 56 refuted. 0 times theorem prover too weak. 3157 trivial. 0 not checked. [2018-11-07 04:59:51,984 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:51,984 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 27 [2018-11-07 04:59:51,984 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:51,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 04:59:51,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 04:59:51,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=596, Unknown=0, NotChecked=0, Total=702 [2018-11-07 04:59:51,986 INFO L87 Difference]: Start difference. First operand 164 states and 172 transitions. Second operand 19 states. [2018-11-07 04:59:54,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:54,233 INFO L93 Difference]: Finished difference Result 361 states and 389 transitions. [2018-11-07 04:59:54,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-11-07 04:59:54,233 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 163 [2018-11-07 04:59:54,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:54,235 INFO L225 Difference]: With dead ends: 361 [2018-11-07 04:59:54,235 INFO L226 Difference]: Without dead ends: 220 [2018-11-07 04:59:54,239 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 311 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2581 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=889, Invalid=8813, Unknown=0, NotChecked=0, Total=9702 [2018-11-07 04:59:54,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-11-07 04:59:54,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 201. [2018-11-07 04:59:54,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-11-07 04:59:54,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 210 transitions. [2018-11-07 04:59:54,260 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 210 transitions. Word has length 163 [2018-11-07 04:59:54,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:54,261 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 210 transitions. [2018-11-07 04:59:54,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 04:59:54,261 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 210 transitions. [2018-11-07 04:59:54,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-11-07 04:59:54,263 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:54,263 INFO L375 BasicCegarLoop]: trace histogram [81, 72, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:54,264 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:54,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:54,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1591963318, now seen corresponding path program 9 times [2018-11-07 04:59:54,264 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:54,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:54,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:54,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:54,265 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:54,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 04:59:54,560 INFO L134 CoverageAnalysis]: Checked inductivity of 6606 backedges. 0 proven. 5958 refuted. 0 times theorem prover too weak. 648 trivial. 0 not checked. [2018-11-07 04:59:54,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:54,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 04:59:54,561 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 04:59:54,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 04:59:54,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 04:59:54,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 04:59:54,570 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 04:59:54,570 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 04:59:54,632 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 04:59:54,632 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 04:59:54,636 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 04:59:54,790 INFO L134 CoverageAnalysis]: Checked inductivity of 6606 backedges. 3794 proven. 72 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2018-11-07 04:59:54,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 04:59:55,021 INFO L134 CoverageAnalysis]: Checked inductivity of 6606 backedges. 3794 proven. 72 refuted. 0 times theorem prover too weak. 2740 trivial. 0 not checked. [2018-11-07 04:59:55,041 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 04:59:55,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 30 [2018-11-07 04:59:55,041 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 04:59:55,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 04:59:55,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 04:59:55,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=760, Unknown=0, NotChecked=0, Total=870 [2018-11-07 04:59:55,042 INFO L87 Difference]: Start difference. First operand 201 states and 210 transitions. Second operand 21 states. [2018-11-07 04:59:59,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 04:59:59,678 INFO L93 Difference]: Finished difference Result 439 states and 470 transitions. [2018-11-07 04:59:59,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-11-07 04:59:59,679 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 200 [2018-11-07 04:59:59,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 04:59:59,680 INFO L225 Difference]: With dead ends: 439 [2018-11-07 04:59:59,680 INFO L226 Difference]: Without dead ends: 263 [2018-11-07 04:59:59,685 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 383 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4040 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1000, Invalid=13280, Unknown=0, NotChecked=0, Total=14280 [2018-11-07 04:59:59,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2018-11-07 04:59:59,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 242. [2018-11-07 04:59:59,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-11-07 04:59:59,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 252 transitions. [2018-11-07 04:59:59,717 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 252 transitions. Word has length 200 [2018-11-07 04:59:59,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 04:59:59,717 INFO L480 AbstractCegarLoop]: Abstraction has 242 states and 252 transitions. [2018-11-07 04:59:59,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 04:59:59,718 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 252 transitions. [2018-11-07 04:59:59,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 242 [2018-11-07 04:59:59,721 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 04:59:59,722 INFO L375 BasicCegarLoop]: trace histogram [100, 90, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 04:59:59,722 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 04:59:59,722 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 04:59:59,722 INFO L82 PathProgramCache]: Analyzing trace with hash 820866598, now seen corresponding path program 10 times [2018-11-07 04:59:59,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 04:59:59,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:59,723 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 04:59:59,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 04:59:59,724 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 04:59:59,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:00,227 INFO L134 CoverageAnalysis]: Checked inductivity of 10055 backedges. 0 proven. 9155 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2018-11-07 05:00:00,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:00,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:00,228 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:00,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:00,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:00,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:00,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:00:00,237 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:00:00,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:00,310 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:00,499 INFO L134 CoverageAnalysis]: Checked inductivity of 10055 backedges. 1820 proven. 90 refuted. 0 times theorem prover too weak. 8145 trivial. 0 not checked. [2018-11-07 05:00:00,499 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:00,793 INFO L134 CoverageAnalysis]: Checked inductivity of 10055 backedges. 1820 proven. 90 refuted. 0 times theorem prover too weak. 8145 trivial. 0 not checked. [2018-11-07 05:00:00,813 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:00,813 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 33 [2018-11-07 05:00:00,813 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:00,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-11-07 05:00:00,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-11-07 05:00:00,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=938, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 05:00:00,816 INFO L87 Difference]: Start difference. First operand 242 states and 252 transitions. Second operand 23 states. [2018-11-07 05:00:05,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:05,232 INFO L93 Difference]: Finished difference Result 525 states and 559 transitions. [2018-11-07 05:00:05,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2018-11-07 05:00:05,232 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 241 [2018-11-07 05:00:05,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:05,234 INFO L225 Difference]: With dead ends: 525 [2018-11-07 05:00:05,234 INFO L226 Difference]: Without dead ends: 310 [2018-11-07 05:00:05,240 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 464 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6040 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1163, Invalid=19143, Unknown=0, NotChecked=0, Total=20306 [2018-11-07 05:00:05,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2018-11-07 05:00:05,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 287. [2018-11-07 05:00:05,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-11-07 05:00:05,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 298 transitions. [2018-11-07 05:00:05,260 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 298 transitions. Word has length 241 [2018-11-07 05:00:05,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:05,261 INFO L480 AbstractCegarLoop]: Abstraction has 287 states and 298 transitions. [2018-11-07 05:00:05,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-11-07 05:00:05,261 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 298 transitions. [2018-11-07 05:00:05,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-11-07 05:00:05,265 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:05,265 INFO L375 BasicCegarLoop]: trace histogram [121, 110, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:05,265 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:05,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:05,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1520240322, now seen corresponding path program 11 times [2018-11-07 05:00:05,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:05,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:05,267 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:00:05,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:05,267 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:05,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:05,694 INFO L134 CoverageAnalysis]: Checked inductivity of 14707 backedges. 0 proven. 13497 refuted. 0 times theorem prover too weak. 1210 trivial. 0 not checked. [2018-11-07 05:00:05,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:05,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:05,695 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:05,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:05,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:05,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:05,705 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:00:05,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 05:00:12,041 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-11-07 05:00:12,042 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:00:12,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:12,479 INFO L134 CoverageAnalysis]: Checked inductivity of 14707 backedges. 0 proven. 13577 refuted. 0 times theorem prover too weak. 1130 trivial. 0 not checked. [2018-11-07 05:00:12,480 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:30,520 INFO L134 CoverageAnalysis]: Checked inductivity of 14707 backedges. 60 proven. 13272 refuted. 245 times theorem prover too weak. 1130 trivial. 0 not checked. [2018-11-07 05:00:30,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:30,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 20] total 37 [2018-11-07 05:00:30,552 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:30,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 05:00:30,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 05:00:30,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=938, Unknown=6, NotChecked=0, Total=1332 [2018-11-07 05:00:30,554 INFO L87 Difference]: Start difference. First operand 287 states and 298 transitions. Second operand 19 states. [2018-11-07 05:00:31,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:31,072 INFO L93 Difference]: Finished difference Result 340 states and 353 transitions. [2018-11-07 05:00:31,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 05:00:31,073 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 286 [2018-11-07 05:00:31,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:31,076 INFO L225 Difference]: With dead ends: 340 [2018-11-07 05:00:31,076 INFO L226 Difference]: Without dead ends: 335 [2018-11-07 05:00:31,077 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 548 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 18.2s TimeCoverageRelationStatistics Valid=388, Invalid=938, Unknown=6, NotChecked=0, Total=1332 [2018-11-07 05:00:31,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2018-11-07 05:00:31,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 312. [2018-11-07 05:00:31,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 312 states. [2018-11-07 05:00:31,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 324 transitions. [2018-11-07 05:00:31,111 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 324 transitions. Word has length 286 [2018-11-07 05:00:31,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:31,113 INFO L480 AbstractCegarLoop]: Abstraction has 312 states and 324 transitions. [2018-11-07 05:00:31,113 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 05:00:31,113 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 324 transitions. [2018-11-07 05:00:31,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 312 [2018-11-07 05:00:31,118 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:31,118 INFO L375 BasicCegarLoop]: trace histogram [132, 120, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:31,118 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:31,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:31,119 INFO L82 PathProgramCache]: Analyzing trace with hash 2024589542, now seen corresponding path program 12 times [2018-11-07 05:00:31,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:31,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:31,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:00:31,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:31,120 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:31,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:31,695 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-11-07 05:00:31,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:31,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:31,695 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:31,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:31,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:31,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:31,703 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 05:00:31,703 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 05:00:31,798 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 05:00:31,798 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 05:00:31,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:31,964 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-11-07 05:00:31,965 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:32,642 INFO L134 CoverageAnalysis]: Checked inductivity of 17514 backedges. 0 proven. 16194 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-11-07 05:00:32,663 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:32,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-11-07 05:00:32,663 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:32,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-11-07 05:00:32,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-11-07 05:00:32,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 05:00:32,665 INFO L87 Difference]: Start difference. First operand 312 states and 324 transitions. Second operand 15 states. [2018-11-07 05:00:32,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:32,932 INFO L93 Difference]: Finished difference Result 365 states and 379 transitions. [2018-11-07 05:00:32,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 05:00:32,932 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 311 [2018-11-07 05:00:32,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:32,934 INFO L225 Difference]: With dead ends: 365 [2018-11-07 05:00:32,934 INFO L226 Difference]: Without dead ends: 360 [2018-11-07 05:00:32,935 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 637 GetRequests, 609 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-11-07 05:00:32,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-11-07 05:00:32,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 337. [2018-11-07 05:00:32,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-11-07 05:00:32,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 350 transitions. [2018-11-07 05:00:32,962 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 350 transitions. Word has length 311 [2018-11-07 05:00:32,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:32,962 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 350 transitions. [2018-11-07 05:00:32,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-11-07 05:00:32,962 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 350 transitions. [2018-11-07 05:00:32,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-11-07 05:00:32,967 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:32,967 INFO L375 BasicCegarLoop]: trace histogram [143, 130, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:32,967 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:32,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:32,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1437047234, now seen corresponding path program 13 times [2018-11-07 05:00:32,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:32,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:32,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 05:00:32,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:32,969 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:33,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:33,454 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-11-07 05:00:33,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:33,455 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:33,455 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:33,455 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:33,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:33,455 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:33,463 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:00:33,463 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 05:00:33,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:33,559 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 05:00:33,770 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-11-07 05:00:33,770 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 05:00:34,525 INFO L134 CoverageAnalysis]: Checked inductivity of 20566 backedges. 0 proven. 19136 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-11-07 05:00:34,546 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 05:00:34,546 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-11-07 05:00:34,546 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 05:00:34,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 05:00:34,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 05:00:34,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 05:00:34,548 INFO L87 Difference]: Start difference. First operand 337 states and 350 transitions. Second operand 16 states. [2018-11-07 05:00:35,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 05:00:35,741 INFO L93 Difference]: Finished difference Result 390 states and 405 transitions. [2018-11-07 05:00:35,741 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 05:00:35,741 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 336 [2018-11-07 05:00:35,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 05:00:35,743 INFO L225 Difference]: With dead ends: 390 [2018-11-07 05:00:35,743 INFO L226 Difference]: Without dead ends: 385 [2018-11-07 05:00:35,744 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 658 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-11-07 05:00:35,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2018-11-07 05:00:35,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 362. [2018-11-07 05:00:35,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 362 states. [2018-11-07 05:00:35,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 376 transitions. [2018-11-07 05:00:35,776 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 376 transitions. Word has length 336 [2018-11-07 05:00:35,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 05:00:35,776 INFO L480 AbstractCegarLoop]: Abstraction has 362 states and 376 transitions. [2018-11-07 05:00:35,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 05:00:35,777 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 376 transitions. [2018-11-07 05:00:35,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2018-11-07 05:00:35,779 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 05:00:35,779 INFO L375 BasicCegarLoop]: trace histogram [154, 140, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 05:00:35,780 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 05:00:35,780 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 05:00:35,780 INFO L82 PathProgramCache]: Analyzing trace with hash 163314662, now seen corresponding path program 14 times [2018-11-07 05:00:35,780 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 05:00:35,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:35,781 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 05:00:35,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 05:00:35,781 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 05:00:35,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 05:00:37,042 INFO L134 CoverageAnalysis]: Checked inductivity of 23863 backedges. 0 proven. 22323 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-11-07 05:00:37,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:37,043 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 05:00:37,043 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 05:00:37,043 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 05:00:37,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 05:00:37,043 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 05:00:37,052 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 05:00:37,052 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown