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-INT.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 16:47:18,521 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 16:47:18,523 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 16:47:18,537 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 16:47:18,537 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 16:47:18,538 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 16:47:18,541 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 16:47:18,543 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 16:47:18,545 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 16:47:18,553 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 16:47:18,553 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 16:47:18,555 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 16:47:18,556 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 16:47:18,558 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 16:47:18,560 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 16:47:18,560 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 16:47:18,561 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 16:47:18,563 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 16:47:18,568 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 16:47:18,569 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 16:47:18,570 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 16:47:18,572 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 16:47:18,576 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 16:47:18,577 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 16:47:18,577 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 16:47:18,578 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 16:47:18,579 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 16:47:18,579 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 16:47:18,581 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 16:47:18,583 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 16:47:18,583 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 16:47:18,584 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 16:47:18,584 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 16:47:18,584 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 16:47:18,585 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 16:47:18,586 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 16:47:18,586 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-11-07 16:47:18,614 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 16:47:18,614 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 16:47:18,616 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 16:47:18,616 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 16:47:18,616 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 16:47:18,616 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 16:47:18,617 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 16:47:18,617 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 16:47:18,617 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 16:47:18,617 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 16:47:18,617 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 16:47:18,618 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 16:47:18,619 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 16:47:18,619 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 16:47:18,619 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 16:47:18,619 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 16:47:18,619 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 16:47:18,621 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 16:47:18,622 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 16:47:18,622 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 16:47:18,622 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 16:47:18,622 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 16:47:18,622 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 16:47:18,623 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 16:47:18,623 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:47:18,623 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 16:47:18,623 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 16:47:18,623 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 16:47:18,624 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 16:47:18,624 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 16:47:18,624 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 16:47:18,624 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 16:47:18,624 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 16:47:18,624 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 16:47:18,687 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 16:47:18,707 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 16:47:18,711 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 16:47:18,712 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 16:47:18,713 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 16:47:18,713 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-11-07 16:47:18,773 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4f3b71e87/bf04d54cc80743c89a861c3d86638958/FLAG66fdc24a9 [2018-11-07 16:47:19,243 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 16:47:19,243 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_k_true-unreach-call_true-termination.i [2018-11-07 16:47:19,249 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4f3b71e87/bf04d54cc80743c89a861c3d86638958/FLAG66fdc24a9 [2018-11-07 16:47:19,263 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4f3b71e87/bf04d54cc80743c89a861c3d86638958 [2018-11-07 16:47:19,273 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 16:47:19,274 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 16:47:19,275 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 16:47:19,276 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 16:47:19,280 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 16:47:19,280 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,284 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@406348dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19, skipping insertion in model container [2018-11-07 16:47:19,284 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,294 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 16:47:19,316 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 16:47:19,553 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:47:19,559 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 16:47:19,578 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:47:19,596 INFO L193 MainTranslator]: Completed translation [2018-11-07 16:47:19,596 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19 WrapperNode [2018-11-07 16:47:19,596 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 16:47:19,597 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 16:47:19,597 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 16:47:19,598 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 16:47:19,608 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,615 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,621 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 16:47:19,622 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 16:47:19,622 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 16:47:19,622 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 16:47:19,630 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,630 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,630 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,631 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,633 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,638 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,639 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (1/1) ... [2018-11-07 16:47:19,640 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 16:47:19,641 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 16:47:19,641 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 16:47:19,641 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 16:47:19,642 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (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 16:47:19,774 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 16:47:19,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 16:47:19,774 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 16:47:19,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 16:47:19,775 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 16:47:19,775 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 16:47:19,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 16:47:19,775 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 16:47:19,995 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 16:47:19,995 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:47:19 BoogieIcfgContainer [2018-11-07 16:47:19,996 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 16:47:19,997 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 16:47:19,997 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 16:47:20,000 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 16:47:20,001 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:47:19" (1/3) ... [2018-11-07 16:47:20,001 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c11fbf8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:47:20, skipping insertion in model container [2018-11-07 16:47:20,002 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:47:19" (2/3) ... [2018-11-07 16:47:20,002 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c11fbf8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:47:20, skipping insertion in model container [2018-11-07 16:47:20,002 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:47:19" (3/3) ... [2018-11-07 16:47:20,004 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_k_true-unreach-call_true-termination.i [2018-11-07 16:47:20,015 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 16:47:20,024 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 16:47:20,047 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 16:47:20,091 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 16:47:20,091 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 16:47:20,091 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 16:47:20,091 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 16:47:20,092 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 16:47:20,092 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 16:47:20,092 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 16:47:20,093 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 16:47:20,115 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-07 16:47:20,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 16:47:20,124 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:20,125 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:20,134 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:20,143 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:20,144 INFO L82 PathProgramCache]: Analyzing trace with hash 1152414567, now seen corresponding path program 1 times [2018-11-07 16:47:20,147 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:20,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:20,214 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:20,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:20,214 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:20,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:20,275 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 16:47:20,277 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:47:20,277 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 16:47:20,277 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:47:20,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 16:47:20,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 16:47:20,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:47:20,295 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-07 16:47:20,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:20,317 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-11-07 16:47:20,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 16:47:20,319 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-11-07 16:47:20,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:20,328 INFO L225 Difference]: With dead ends: 33 [2018-11-07 16:47:20,328 INFO L226 Difference]: Without dead ends: 14 [2018-11-07 16:47:20,332 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 16:47:20,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-07 16:47:20,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-07 16:47:20,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-07 16:47:20,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-11-07 16:47:20,367 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-11-07 16:47:20,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:20,367 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-11-07 16:47:20,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 16:47:20,368 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-11-07 16:47:20,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-11-07 16:47:20,369 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:20,369 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:20,369 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:20,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:20,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1083883255, now seen corresponding path program 1 times [2018-11-07 16:47:20,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:20,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:20,372 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:20,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:20,372 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:20,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:20,635 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 16:47:20,636 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:47:20,636 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-11-07 16:47:20,636 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:47:20,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 16:47:20,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 16:47:20,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-11-07 16:47:20,640 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2018-11-07 16:47:20,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:20,769 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-11-07 16:47:20,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 16:47:20,770 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2018-11-07 16:47:20,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:20,771 INFO L225 Difference]: With dead ends: 21 [2018-11-07 16:47:20,771 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 16:47:20,772 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-11-07 16:47:20,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 16:47:20,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-07 16:47:20,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-07 16:47:20,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-11-07 16:47:20,778 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 12 [2018-11-07 16:47:20,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:20,778 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-11-07 16:47:20,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 16:47:20,778 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-11-07 16:47:20,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 16:47:20,779 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:20,779 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:20,779 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:20,780 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:20,780 INFO L82 PathProgramCache]: Analyzing trace with hash 1128913667, now seen corresponding path program 1 times [2018-11-07 16:47:20,780 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:20,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:20,781 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:20,781 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:20,782 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:20,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:20,886 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:20,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:20,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:20,888 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-11-07 16:47:20,890 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 16:47:20,925 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:47:20,926 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:47:21,160 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:47:21,164 INFO L272 AbstractInterpreter]: Visited 14 different actions 62 times. Merged at 4 different actions 24 times. Widened at 1 different actions 2 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-11-07 16:47:21,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:21,184 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:47:21,184 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:21,185 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 16:47:21,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:21,198 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:47:21,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:21,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:21,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:21,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:21,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:21,644 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:21,644 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-11-07 16:47:21,644 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:21,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 16:47:21,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 16:47:21,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-11-07 16:47:21,645 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 7 states. [2018-11-07 16:47:21,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:21,776 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-11-07 16:47:21,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 16:47:21,777 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-11-07 16:47:21,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:21,778 INFO L225 Difference]: With dead ends: 30 [2018-11-07 16:47:21,778 INFO L226 Difference]: Without dead ends: 25 [2018-11-07 16:47:21,779 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-11-07 16:47:21,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-07 16:47:21,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-11-07 16:47:21,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-11-07 16:47:21,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-11-07 16:47:21,785 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 15 [2018-11-07 16:47:21,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:21,785 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-11-07 16:47:21,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 16:47:21,786 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-11-07 16:47:21,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-11-07 16:47:21,786 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:21,787 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:21,787 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:21,787 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:21,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1437681655, now seen corresponding path program 2 times [2018-11-07 16:47:21,787 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:21,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:21,788 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:21,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:21,789 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:21,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:22,065 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:22,065 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:22,066 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:22,066 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:22,066 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:22,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:22,067 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 16:47:22,084 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:47:22,084 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:47:22,102 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 16:47:22,102 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:22,105 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:22,285 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:22,286 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:22,587 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:22,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:22,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-11-07 16:47:22,622 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:22,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 16:47:22,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 16:47:22,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2018-11-07 16:47:22,624 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2018-11-07 16:47:23,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:23,093 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2018-11-07 16:47:23,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 16:47:23,093 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2018-11-07 16:47:23,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:23,095 INFO L225 Difference]: With dead ends: 39 [2018-11-07 16:47:23,095 INFO L226 Difference]: Without dead ends: 34 [2018-11-07 16:47:23,096 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=127, Invalid=253, Unknown=0, NotChecked=0, Total=380 [2018-11-07 16:47:23,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-07 16:47:23,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-11-07 16:47:23,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-11-07 16:47:23,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-11-07 16:47:23,102 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 24 [2018-11-07 16:47:23,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:23,103 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-11-07 16:47:23,103 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 16:47:23,103 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-11-07 16:47:23,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-11-07 16:47:23,104 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:23,105 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:23,105 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:23,105 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:23,105 INFO L82 PathProgramCache]: Analyzing trace with hash -656200317, now seen corresponding path program 3 times [2018-11-07 16:47:23,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:23,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:23,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:47:23,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:23,107 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:23,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:23,332 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:23,333 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:23,333 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:23,333 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:23,333 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:23,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:23,334 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 16:47:23,345 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:47:23,345 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:47:23,365 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:47:23,365 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:23,368 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:23,498 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:23,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:23,850 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:23,870 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:23,870 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-11-07 16:47:23,870 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:23,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 16:47:23,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 16:47:23,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-11-07 16:47:23,872 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 13 states. [2018-11-07 16:47:24,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:24,194 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2018-11-07 16:47:24,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 16:47:24,202 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-11-07 16:47:24,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:24,203 INFO L225 Difference]: With dead ends: 48 [2018-11-07 16:47:24,204 INFO L226 Difference]: Without dead ends: 43 [2018-11-07 16:47:24,206 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=277, Invalid=535, Unknown=0, NotChecked=0, Total=812 [2018-11-07 16:47:24,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-11-07 16:47:24,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-11-07 16:47:24,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-07 16:47:24,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-11-07 16:47:24,218 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 33 [2018-11-07 16:47:24,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:24,218 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-11-07 16:47:24,218 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 16:47:24,223 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-11-07 16:47:24,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-11-07 16:47:24,224 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:24,224 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:24,225 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:24,225 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:24,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1490238089, now seen corresponding path program 4 times [2018-11-07 16:47:24,225 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:24,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:24,227 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:47:24,227 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:24,228 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:24,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:25,158 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:25,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:25,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:25,159 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:25,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:25,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:25,160 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 16:47:25,176 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:25,176 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:47:25,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:25,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:25,288 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:25,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:25,842 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:25,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:25,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-11-07 16:47:25,862 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:25,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 16:47:25,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 16:47:25,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=441, Unknown=0, NotChecked=0, Total=650 [2018-11-07 16:47:25,864 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 16 states. [2018-11-07 16:47:26,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:26,369 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-11-07 16:47:26,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 16:47:26,371 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 42 [2018-11-07 16:47:26,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:26,372 INFO L225 Difference]: With dead ends: 57 [2018-11-07 16:47:26,373 INFO L226 Difference]: Without dead ends: 52 [2018-11-07 16:47:26,374 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 16:47:26,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-11-07 16:47:26,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-11-07 16:47:26,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-11-07 16:47:26,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-11-07 16:47:26,382 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 42 [2018-11-07 16:47:26,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:26,383 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-11-07 16:47:26,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 16:47:26,383 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-11-07 16:47:26,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-11-07 16:47:26,384 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:26,384 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:26,385 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:26,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:26,385 INFO L82 PathProgramCache]: Analyzing trace with hash 45932547, now seen corresponding path program 5 times [2018-11-07 16:47:26,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:26,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:26,387 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:26,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:26,387 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:26,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:26,875 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:26,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:26,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:26,876 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:26,876 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:26,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:26,876 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 16:47:26,886 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:47:26,886 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:47:26,921 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-11-07 16:47:26,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:26,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:27,092 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:27,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:27,630 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:27,650 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:27,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-11-07 16:47:27,651 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:27,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 16:47:27,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 16:47:27,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=666, Unknown=0, NotChecked=0, Total=992 [2018-11-07 16:47:27,654 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 19 states. [2018-11-07 16:47:28,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:28,405 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2018-11-07 16:47:28,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 16:47:28,408 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 51 [2018-11-07 16:47:28,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:28,409 INFO L225 Difference]: With dead ends: 66 [2018-11-07 16:47:28,410 INFO L226 Difference]: Without dead ends: 61 [2018-11-07 16:47:28,411 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=766, Invalid=1396, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 16:47:28,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-07 16:47:28,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-11-07 16:47:28,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-11-07 16:47:28,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-11-07 16:47:28,420 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 51 [2018-11-07 16:47:28,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:28,420 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-11-07 16:47:28,420 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 16:47:28,421 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-11-07 16:47:28,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-11-07 16:47:28,422 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:28,423 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:28,423 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:28,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:28,423 INFO L82 PathProgramCache]: Analyzing trace with hash -1227627785, now seen corresponding path program 6 times [2018-11-07 16:47:28,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:28,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:28,424 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:47:28,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:28,425 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:28,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:29,262 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:29,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:29,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:29,263 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:29,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:29,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:29,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:47:29,274 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:47:29,274 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:47:29,290 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:47:29,291 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:29,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:29,385 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:29,385 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:30,150 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:30,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:30,171 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-11-07 16:47:30,171 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:30,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 16:47:30,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 16:47:30,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=936, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 16:47:30,173 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 22 states. [2018-11-07 16:47:31,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:31,056 INFO L93 Difference]: Finished difference Result 75 states and 77 transitions. [2018-11-07 16:47:31,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 16:47:31,057 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 60 [2018-11-07 16:47:31,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:31,058 INFO L225 Difference]: With dead ends: 75 [2018-11-07 16:47:31,058 INFO L226 Difference]: Without dead ends: 70 [2018-11-07 16:47:31,059 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1105, Invalid=1975, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 16:47:31,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-11-07 16:47:31,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-11-07 16:47:31,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-11-07 16:47:31,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-11-07 16:47:31,068 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 60 [2018-11-07 16:47:31,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:31,068 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-11-07 16:47:31,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 16:47:31,069 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-11-07 16:47:31,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-11-07 16:47:31,070 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:31,070 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:31,071 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:31,071 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:31,071 INFO L82 PathProgramCache]: Analyzing trace with hash 360641155, now seen corresponding path program 7 times [2018-11-07 16:47:31,071 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:31,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:31,072 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:47:31,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:31,072 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:31,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:31,559 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:31,559 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:31,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:31,560 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:31,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:31,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:31,560 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 16:47:31,569 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:31,569 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:47:31,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:31,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:31,698 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:31,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:32,893 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:32,912 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:32,913 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-11-07 16:47:32,913 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:32,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 16:47:32,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 16:47:32,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=1251, Unknown=0, NotChecked=0, Total=1892 [2018-11-07 16:47:32,914 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 25 states. [2018-11-07 16:47:34,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:34,127 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2018-11-07 16:47:34,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 16:47:34,128 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 69 [2018-11-07 16:47:34,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:34,130 INFO L225 Difference]: With dead ends: 84 [2018-11-07 16:47:34,130 INFO L226 Difference]: Without dead ends: 79 [2018-11-07 16:47:34,132 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1507, Invalid=2653, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 16:47:34,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-11-07 16:47:34,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-11-07 16:47:34,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 16:47:34,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2018-11-07 16:47:34,143 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 69 [2018-11-07 16:47:34,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:34,143 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2018-11-07 16:47:34,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 16:47:34,144 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2018-11-07 16:47:34,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-11-07 16:47:34,145 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:34,145 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:34,146 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:34,146 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:34,146 INFO L82 PathProgramCache]: Analyzing trace with hash -318857097, now seen corresponding path program 8 times [2018-11-07 16:47:34,146 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:34,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:34,147 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:34,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:34,147 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:34,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:34,610 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:34,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:34,610 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:34,611 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:34,611 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:34,611 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:34,611 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 16:47:34,622 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:47:34,622 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:47:34,646 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-11-07 16:47:34,646 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:34,650 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:34,770 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:34,770 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:35,584 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:35,605 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:35,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-11-07 16:47:35,606 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:35,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 16:47:35,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 16:47:35,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=839, Invalid=1611, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 16:47:35,607 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 28 states. [2018-11-07 16:47:36,536 WARN L179 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 11 [2018-11-07 16:47:37,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:37,419 INFO L93 Difference]: Finished difference Result 93 states and 95 transitions. [2018-11-07 16:47:37,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 16:47:37,421 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 78 [2018-11-07 16:47:37,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:37,423 INFO L225 Difference]: With dead ends: 93 [2018-11-07 16:47:37,423 INFO L226 Difference]: Without dead ends: 88 [2018-11-07 16:47:37,425 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1972, Invalid=3430, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 16:47:37,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-11-07 16:47:37,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-11-07 16:47:37,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-11-07 16:47:37,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-11-07 16:47:37,441 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 78 [2018-11-07 16:47:37,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:37,442 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-11-07 16:47:37,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 16:47:37,442 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-11-07 16:47:37,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-07 16:47:37,443 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:37,444 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:37,444 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:37,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:37,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1949211389, now seen corresponding path program 9 times [2018-11-07 16:47:37,444 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:37,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:37,445 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:47:37,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:37,445 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:37,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:38,607 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:38,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:38,608 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:38,608 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:38,608 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:38,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:38,608 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 16:47:38,622 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:47:38,622 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:47:38,649 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:47:38,650 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:38,656 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:38,812 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:38,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:39,995 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:40,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:40,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-11-07 16:47:40,016 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:40,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 16:47:40,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 16:47:40,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1064, Invalid=2016, Unknown=0, NotChecked=0, Total=3080 [2018-11-07 16:47:40,019 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 31 states. [2018-11-07 16:47:40,876 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 11 [2018-11-07 16:47:42,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:42,122 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-11-07 16:47:42,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-11-07 16:47:42,129 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 87 [2018-11-07 16:47:42,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:42,130 INFO L225 Difference]: With dead ends: 102 [2018-11-07 16:47:42,130 INFO L226 Difference]: Without dead ends: 97 [2018-11-07 16:47:42,133 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 146 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2500, Invalid=4306, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 16:47:42,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-11-07 16:47:42,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-11-07 16:47:42,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-11-07 16:47:42,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2018-11-07 16:47:42,146 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 87 [2018-11-07 16:47:42,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:42,146 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2018-11-07 16:47:42,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 16:47:42,146 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2018-11-07 16:47:42,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-11-07 16:47:42,150 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:42,150 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:42,150 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:42,151 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:42,151 INFO L82 PathProgramCache]: Analyzing trace with hash 1275395575, now seen corresponding path program 10 times [2018-11-07 16:47:42,151 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:42,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:42,157 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:47:42,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:42,157 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:42,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:42,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:42,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:42,737 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:42,737 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:42,737 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:42,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:42,738 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 16:47:42,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:42,750 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:47:42,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:42,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:42,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:42,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:44,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:44,463 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:44,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-11-07 16:47:44,464 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:44,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 16:47:44,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 16:47:44,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1316, Invalid=2466, Unknown=0, NotChecked=0, Total=3782 [2018-11-07 16:47:44,466 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 34 states. [2018-11-07 16:47:46,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:46,548 INFO L93 Difference]: Finished difference Result 111 states and 113 transitions. [2018-11-07 16:47:46,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 16:47:46,548 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2018-11-07 16:47:46,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:46,550 INFO L225 Difference]: With dead ends: 111 [2018-11-07 16:47:46,550 INFO L226 Difference]: Without dead ends: 106 [2018-11-07 16:47:46,553 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 161 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3091, Invalid=5281, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 16:47:46,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-11-07 16:47:46,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-11-07 16:47:46,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-11-07 16:47:46,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-11-07 16:47:46,561 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 96 [2018-11-07 16:47:46,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:46,561 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-11-07 16:47:46,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 16:47:46,562 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-11-07 16:47:46,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-11-07 16:47:46,564 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:46,565 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:46,565 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:46,565 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:46,565 INFO L82 PathProgramCache]: Analyzing trace with hash -2040776829, now seen corresponding path program 11 times [2018-11-07 16:47:46,565 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:46,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:46,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:46,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:46,567 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:46,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:47,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:47,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:47,366 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:47,366 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:47,366 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:47,366 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:47,366 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 16:47:47,379 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:47:47,379 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:47:47,432 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-11-07 16:47:47,432 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:47,435 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:47,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:47,560 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:49,252 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:49,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:49,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-11-07 16:47:49,272 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:49,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-11-07 16:47:49,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-11-07 16:47:49,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 16:47:49,275 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 37 states. [2018-11-07 16:47:49,555 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 8 [2018-11-07 16:47:51,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:51,763 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2018-11-07 16:47:51,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-11-07 16:47:51,763 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 105 [2018-11-07 16:47:51,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:51,765 INFO L225 Difference]: With dead ends: 120 [2018-11-07 16:47:51,765 INFO L226 Difference]: Without dead ends: 115 [2018-11-07 16:47:51,768 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3745, Invalid=6355, Unknown=0, NotChecked=0, Total=10100 [2018-11-07 16:47:51,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-11-07 16:47:51,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-11-07 16:47:51,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-11-07 16:47:51,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2018-11-07 16:47:51,776 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 105 [2018-11-07 16:47:51,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:51,776 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2018-11-07 16:47:51,776 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-11-07 16:47:51,776 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2018-11-07 16:47:51,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-11-07 16:47:51,778 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:51,778 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:51,778 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:51,778 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:51,778 INFO L82 PathProgramCache]: Analyzing trace with hash -264307849, now seen corresponding path program 12 times [2018-11-07 16:47:51,779 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:51,779 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:51,779 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:47:51,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:51,780 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:51,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:52,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:52,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:52,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:52,664 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:52,664 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:52,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:52,664 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 16:47:52,673 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:47:52,673 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:47:52,726 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:47:52,726 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:47:52,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:47:52,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:52,873 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:47:55,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:55,164 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:47:55,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-11-07 16:47:55,165 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:47:55,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 16:47:55,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 16:47:55,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=3501, Unknown=0, NotChecked=0, Total=5402 [2018-11-07 16:47:55,167 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 40 states. [2018-11-07 16:47:57,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:47:57,952 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2018-11-07 16:47:57,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-11-07 16:47:57,953 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 114 [2018-11-07 16:47:57,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:47:57,955 INFO L225 Difference]: With dead ends: 129 [2018-11-07 16:47:57,955 INFO L226 Difference]: Without dead ends: 124 [2018-11-07 16:47:57,958 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 873 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=4462, Invalid=7528, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 16:47:57,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-11-07 16:47:57,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-11-07 16:47:57,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-11-07 16:47:57,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-11-07 16:47:57,965 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 114 [2018-11-07 16:47:57,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:47:57,965 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-11-07 16:47:57,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 16:47:57,966 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-11-07 16:47:57,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-11-07 16:47:57,967 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:47:57,967 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:47:57,967 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:47:57,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:47:57,968 INFO L82 PathProgramCache]: Analyzing trace with hash 1271360003, now seen corresponding path program 13 times [2018-11-07 16:47:57,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:47:57,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:57,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:47:57,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:47:57,969 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:47:58,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:59,851 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:47:59,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:59,851 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:47:59,851 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:47:59,851 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:47:59,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:47:59,852 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 16:47:59,861 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:47:59,862 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:47:59,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:47:59,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:48:00,158 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:00,158 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:48:02,459 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:02,479 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:48:02,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-11-07 16:48:02,479 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:48:02,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 16:48:02,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 16:48:02,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2234, Invalid=4086, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 16:48:02,482 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 43 states. [2018-11-07 16:48:06,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:48:06,181 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2018-11-07 16:48:06,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 16:48:06,182 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 123 [2018-11-07 16:48:06,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:48:06,183 INFO L225 Difference]: With dead ends: 138 [2018-11-07 16:48:06,184 INFO L226 Difference]: Without dead ends: 133 [2018-11-07 16:48:06,186 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 206 SyntacticMatches, 2 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1005 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=5242, Invalid=8800, Unknown=0, NotChecked=0, Total=14042 [2018-11-07 16:48:06,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-11-07 16:48:06,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-11-07 16:48:06,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-11-07 16:48:06,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 133 transitions. [2018-11-07 16:48:06,192 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 133 transitions. Word has length 123 [2018-11-07 16:48:06,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:48:06,193 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 133 transitions. [2018-11-07 16:48:06,193 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-11-07 16:48:06,193 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 133 transitions. [2018-11-07 16:48:06,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-11-07 16:48:06,194 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:48:06,194 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:48:06,194 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:48:06,194 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:48:06,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1878746889, now seen corresponding path program 14 times [2018-11-07 16:48:06,195 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:48:06,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:06,196 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:48:06,196 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:06,196 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:48:06,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:48:07,253 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:07,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:07,254 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:48:07,254 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:48:07,254 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:48:07,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:07,254 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 16:48:07,263 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:48:07,263 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:48:07,303 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-11-07 16:48:07,303 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:48:07,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:48:07,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:07,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:48:10,187 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:10,207 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:48:10,208 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-11-07 16:48:10,208 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:48:10,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-11-07 16:48:10,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-11-07 16:48:10,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2594, Invalid=4716, Unknown=0, NotChecked=0, Total=7310 [2018-11-07 16:48:10,210 INFO L87 Difference]: Start difference. First operand 133 states and 133 transitions. Second operand 46 states. [2018-11-07 16:48:14,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:48:14,190 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-11-07 16:48:14,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-11-07 16:48:14,190 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 132 [2018-11-07 16:48:14,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:48:14,192 INFO L225 Difference]: With dead ends: 147 [2018-11-07 16:48:14,192 INFO L226 Difference]: Without dead ends: 142 [2018-11-07 16:48:14,193 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 221 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1146 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=6085, Invalid=10171, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 16:48:14,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-11-07 16:48:14,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-11-07 16:48:14,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-11-07 16:48:14,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-11-07 16:48:14,200 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 132 [2018-11-07 16:48:14,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:48:14,201 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-11-07 16:48:14,201 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-11-07 16:48:14,201 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-11-07 16:48:14,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-11-07 16:48:14,202 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:48:14,203 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:48:14,203 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:48:14,203 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:48:14,203 INFO L82 PathProgramCache]: Analyzing trace with hash -927269757, now seen corresponding path program 15 times [2018-11-07 16:48:14,203 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:48:14,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:14,204 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:48:14,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:14,204 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:48:14,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:48:15,802 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:15,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:15,803 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:48:15,803 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:48:15,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:48:15,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:15,803 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:48:15,811 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:48:15,811 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:48:15,850 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:48:15,850 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:48:15,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:48:16,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:16,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:48:18,757 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:18,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:48:18,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-11-07 16:48:18,778 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:48:18,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-11-07 16:48:18,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-11-07 16:48:18,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2981, Invalid=5391, Unknown=0, NotChecked=0, Total=8372 [2018-11-07 16:48:18,780 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 49 states. [2018-11-07 16:48:23,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:48:23,571 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2018-11-07 16:48:23,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-11-07 16:48:23,571 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 141 [2018-11-07 16:48:23,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:48:23,573 INFO L225 Difference]: With dead ends: 156 [2018-11-07 16:48:23,573 INFO L226 Difference]: Without dead ends: 151 [2018-11-07 16:48:23,574 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 373 GetRequests, 236 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1296 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=6991, Invalid=11641, Unknown=0, NotChecked=0, Total=18632 [2018-11-07 16:48:23,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-11-07 16:48:23,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-11-07 16:48:23,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-11-07 16:48:23,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 151 transitions. [2018-11-07 16:48:23,580 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 151 transitions. Word has length 141 [2018-11-07 16:48:23,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:48:23,580 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 151 transitions. [2018-11-07 16:48:23,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-11-07 16:48:23,580 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 151 transitions. [2018-11-07 16:48:23,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-11-07 16:48:23,581 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:48:23,582 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:48:23,582 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:48:23,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:48:23,582 INFO L82 PathProgramCache]: Analyzing trace with hash -72493449, now seen corresponding path program 16 times [2018-11-07 16:48:23,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:48:23,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:23,583 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:48:23,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:23,583 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:48:23,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:48:25,236 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:25,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:25,237 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:48:25,237 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:48:25,237 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:48:25,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:25,237 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:48:25,247 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:48:25,247 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:48:25,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:48:25,422 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:48:25,781 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:25,782 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:48:28,854 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:28,874 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:48:28,874 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-11-07 16:48:28,875 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:48:28,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-11-07 16:48:28,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-11-07 16:48:28,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3395, Invalid=6111, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 16:48:28,876 INFO L87 Difference]: Start difference. First operand 151 states and 151 transitions. Second operand 52 states. [2018-11-07 16:48:29,146 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 141 DAG size of output: 8 [2018-11-07 16:48:29,282 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 9 [2018-11-07 16:48:29,407 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 16:48:29,930 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-11-07 16:48:30,083 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 11 [2018-11-07 16:48:30,236 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 11 [2018-11-07 16:48:34,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:48:34,605 INFO L93 Difference]: Finished difference Result 165 states and 167 transitions. [2018-11-07 16:48:34,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-07 16:48:34,606 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 150 [2018-11-07 16:48:34,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:48:34,607 INFO L225 Difference]: With dead ends: 165 [2018-11-07 16:48:34,608 INFO L226 Difference]: Without dead ends: 160 [2018-11-07 16:48:34,610 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 397 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=7960, Invalid=13210, Unknown=0, NotChecked=0, Total=21170 [2018-11-07 16:48:34,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-11-07 16:48:34,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-11-07 16:48:34,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-11-07 16:48:34,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-11-07 16:48:34,616 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 150 [2018-11-07 16:48:34,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:48:34,616 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-11-07 16:48:34,616 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-11-07 16:48:34,616 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-11-07 16:48:34,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-11-07 16:48:34,617 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:48:34,617 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:48:34,617 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:48:34,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:48:34,618 INFO L82 PathProgramCache]: Analyzing trace with hash 266268419, now seen corresponding path program 17 times [2018-11-07 16:48:34,618 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:48:34,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:34,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:48:34,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:34,619 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:48:34,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:48:36,409 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:36,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:36,410 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:48:36,410 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:48:36,410 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:48:36,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:36,410 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:48:36,426 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:48:36,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:48:36,516 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-11-07 16:48:36,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:48:36,521 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:48:36,701 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:36,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:48:40,427 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:40,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:48:40,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-11-07 16:48:40,447 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:48:40,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-11-07 16:48:40,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-11-07 16:48:40,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3836, Invalid=6876, Unknown=0, NotChecked=0, Total=10712 [2018-11-07 16:48:40,449 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 55 states. [2018-11-07 16:48:40,636 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 8 [2018-11-07 16:48:40,872 WARN L179 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 9 [2018-11-07 16:48:41,022 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 16:48:41,155 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 16:48:41,287 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 16:48:41,420 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 16:48:41,569 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 16:48:41,856 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-11-07 16:48:46,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:48:46,763 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2018-11-07 16:48:46,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-11-07 16:48:46,765 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 159 [2018-11-07 16:48:46,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:48:46,766 INFO L225 Difference]: With dead ends: 174 [2018-11-07 16:48:46,766 INFO L226 Difference]: Without dead ends: 169 [2018-11-07 16:48:46,767 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 266 SyntacticMatches, 2 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=8992, Invalid=14878, Unknown=0, NotChecked=0, Total=23870 [2018-11-07 16:48:46,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-07 16:48:46,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-11-07 16:48:46,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-11-07 16:48:46,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 169 transitions. [2018-11-07 16:48:46,775 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 169 transitions. Word has length 159 [2018-11-07 16:48:46,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:48:46,775 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 169 transitions. [2018-11-07 16:48:46,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-11-07 16:48:46,775 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 169 transitions. [2018-11-07 16:48:46,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-11-07 16:48:46,776 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:48:46,776 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:48:46,777 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:48:46,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:48:46,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1651330057, now seen corresponding path program 18 times [2018-11-07 16:48:46,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:48:46,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:46,778 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:48:46,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:48:46,778 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:48:46,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:48:49,178 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:49,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:49,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:48:49,178 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:48:49,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:48:49,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:48:49,179 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:48:49,187 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:48:49,188 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:48:49,279 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:48:49,279 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:48:49,310 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:48:49,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:49,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:48:53,736 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:48:53,757 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:48:53,757 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-11-07 16:48:53,757 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:48:53,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-11-07 16:48:53,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-11-07 16:48:53,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4304, Invalid=7686, Unknown=0, NotChecked=0, Total=11990 [2018-11-07 16:48:53,759 INFO L87 Difference]: Start difference. First operand 169 states and 169 transitions. Second operand 58 states. [2018-11-07 16:48:53,934 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 8 [2018-11-07 16:48:54,055 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 159 DAG size of output: 8 [2018-11-07 16:48:54,212 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 9 [2018-11-07 16:48:54,362 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 16:48:54,511 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 16:48:54,655 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 16:48:54,805 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 16:48:54,952 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 16:48:55,098 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 16:48:55,407 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 16:48:55,609 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-11-07 16:49:01,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:01,231 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2018-11-07 16:49:01,232 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-11-07 16:49:01,232 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 168 [2018-11-07 16:49:01,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:01,234 INFO L225 Difference]: With dead ends: 183 [2018-11-07 16:49:01,234 INFO L226 Difference]: Without dead ends: 178 [2018-11-07 16:49:01,236 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1800 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=10087, Invalid=16645, Unknown=0, NotChecked=0, Total=26732 [2018-11-07 16:49:01,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-11-07 16:49:01,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-11-07 16:49:01,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-11-07 16:49:01,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-11-07 16:49:01,243 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 168 [2018-11-07 16:49:01,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:01,244 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-11-07 16:49:01,244 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-11-07 16:49:01,244 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-11-07 16:49:01,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-11-07 16:49:01,245 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:01,245 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:01,246 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:01,246 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:01,246 INFO L82 PathProgramCache]: Analyzing trace with hash -639942269, now seen corresponding path program 19 times [2018-11-07 16:49:01,246 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:01,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:01,247 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:01,247 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:01,247 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:01,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:03,276 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:03,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:03,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:03,276 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:03,276 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:03,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:03,277 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:03,285 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:03,285 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:49:03,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:03,555 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:03,833 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:03,833 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:08,350 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:08,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:08,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-11-07 16:49:08,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:08,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-11-07 16:49:08,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-11-07 16:49:08,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4799, Invalid=8541, Unknown=0, NotChecked=0, Total=13340 [2018-11-07 16:49:08,373 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 61 states. [2018-11-07 16:49:08,586 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 165 DAG size of output: 8 [2018-11-07 16:49:08,718 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 8 [2018-11-07 16:49:08,868 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 9 [2018-11-07 16:49:09,023 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 16:49:09,183 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 16:49:09,340 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 16:49:09,499 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 16:49:09,665 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 16:49:09,829 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 16:49:09,993 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 16:49:10,154 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 16:49:10,319 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 16:49:10,484 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 16:49:10,839 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-11-07 16:49:11,014 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 11 [2018-11-07 16:49:11,205 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 11 [2018-11-07 16:49:16,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:16,770 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-11-07 16:49:16,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-11-07 16:49:16,770 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 177 [2018-11-07 16:49:16,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:16,772 INFO L225 Difference]: With dead ends: 192 [2018-11-07 16:49:16,772 INFO L226 Difference]: Without dead ends: 187 [2018-11-07 16:49:16,774 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 296 SyntacticMatches, 2 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1986 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=11245, Invalid=18511, Unknown=0, NotChecked=0, Total=29756 [2018-11-07 16:49:16,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-11-07 16:49:16,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-11-07 16:49:16,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-11-07 16:49:16,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 187 transitions. [2018-11-07 16:49:16,782 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 187 transitions. Word has length 177 [2018-11-07 16:49:16,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:16,783 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 187 transitions. [2018-11-07 16:49:16,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-11-07 16:49:16,783 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 187 transitions. [2018-11-07 16:49:16,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-11-07 16:49:16,784 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:16,784 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:16,785 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:16,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:16,785 INFO L82 PathProgramCache]: Analyzing trace with hash -99929737, now seen corresponding path program 20 times [2018-11-07 16:49:16,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:16,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:16,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:16,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:16,786 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:17,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:20,348 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:20,348 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:20,349 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:20,349 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:20,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:20,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:20,349 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:20,362 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:49:20,362 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:49:20,523 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-11-07 16:49:20,523 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:49:20,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:20,713 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:20,713 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:25,837 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:25,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:25,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-11-07 16:49:25,867 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:25,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-11-07 16:49:25,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-11-07 16:49:25,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5321, Invalid=9441, Unknown=0, NotChecked=0, Total=14762 [2018-11-07 16:49:25,869 INFO L87 Difference]: Start difference. First operand 187 states and 187 transitions. Second operand 64 states. [2018-11-07 16:49:26,143 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 8 [2018-11-07 16:49:26,310 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 177 DAG size of output: 8 [2018-11-07 16:49:26,483 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 9 [2018-11-07 16:49:26,642 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 16:49:26,812 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 16:49:26,982 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 16:49:27,147 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 16:49:27,322 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 16:49:27,492 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 16:49:27,663 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 16:49:27,844 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 16:49:28,028 WARN L179 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 16:49:28,204 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 16:49:28,375 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 16:49:28,553 WARN L179 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 16:49:35,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:35,158 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2018-11-07 16:49:35,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-11-07 16:49:35,161 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 186 [2018-11-07 16:49:35,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:35,162 INFO L225 Difference]: With dead ends: 201 [2018-11-07 16:49:35,162 INFO L226 Difference]: Without dead ends: 196 [2018-11-07 16:49:35,163 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 311 SyntacticMatches, 2 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2181 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=12466, Invalid=20476, Unknown=0, NotChecked=0, Total=32942 [2018-11-07 16:49:35,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-11-07 16:49:35,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-11-07 16:49:35,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-11-07 16:49:35,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-11-07 16:49:35,171 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 186 [2018-11-07 16:49:35,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:35,171 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-11-07 16:49:35,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-11-07 16:49:35,172 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-11-07 16:49:35,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-11-07 16:49:35,173 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:35,173 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:35,173 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:35,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:35,173 INFO L82 PathProgramCache]: Analyzing trace with hash 89650179, now seen corresponding path program 21 times [2018-11-07 16:49:35,174 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:35,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:35,174 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:35,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:35,174 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:35,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:38,198 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:38,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:38,198 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:38,198 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:38,198 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:38,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:38,199 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:38,214 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:49:38,215 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:49:38,397 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:49:38,398 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:49:38,471 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:38,704 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:38,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:44,265 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:44,285 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:44,285 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-11-07 16:49:44,285 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:44,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-11-07 16:49:44,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-11-07 16:49:44,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5870, Invalid=10386, Unknown=0, NotChecked=0, Total=16256 [2018-11-07 16:49:44,287 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 67 states. [2018-11-07 16:49:44,545 WARN L179 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 183 DAG size of output: 8 [2018-11-07 16:49:44,693 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 186 DAG size of output: 8 [2018-11-07 16:49:44,868 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 9 [2018-11-07 16:49:45,037 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 16:49:45,218 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 16:49:45,396 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 16:49:45,578 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 16:49:45,764 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 16:49:45,945 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 16:49:46,129 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 16:49:46,315 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 16:49:46,505 WARN L179 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 16:49:46,704 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 16:49:46,907 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 16:49:47,091 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 16:49:47,286 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 16:49:47,472 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 16:49:47,766 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 16:49:47,953 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 16:49:48,143 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 16:49:54,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:54,890 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2018-11-07 16:49:54,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-11-07 16:49:54,891 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 195 [2018-11-07 16:49:54,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:54,892 INFO L225 Difference]: With dead ends: 210 [2018-11-07 16:49:54,893 INFO L226 Difference]: Without dead ends: 205 [2018-11-07 16:49:54,894 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 326 SyntacticMatches, 2 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2385 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=13750, Invalid=22540, Unknown=0, NotChecked=0, Total=36290 [2018-11-07 16:49:54,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-11-07 16:49:54,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 205. [2018-11-07 16:49:54,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-11-07 16:49:54,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 205 transitions. [2018-11-07 16:49:54,902 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 205 transitions. Word has length 195 [2018-11-07 16:49:54,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:54,902 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 205 transitions. [2018-11-07 16:49:54,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-11-07 16:49:54,902 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 205 transitions. [2018-11-07 16:49:54,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-11-07 16:49:54,903 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:54,903 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:54,903 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:54,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:54,903 INFO L82 PathProgramCache]: Analyzing trace with hash 795823863, now seen corresponding path program 22 times [2018-11-07 16:49:54,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:54,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:54,904 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:54,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:54,904 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:55,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:57,550 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:57,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:57,551 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:57,551 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:57,551 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:57,551 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:57,551 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:57,559 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:57,559 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:49:57,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:57,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:58,197 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:58,198 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:04,184 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:04,203 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:04,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-11-07 16:50:04,204 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:04,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-11-07 16:50:04,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-11-07 16:50:04,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6446, Invalid=11376, Unknown=0, NotChecked=0, Total=17822 [2018-11-07 16:50:04,205 INFO L87 Difference]: Start difference. First operand 205 states and 205 transitions. Second operand 70 states. [2018-11-07 16:50:04,431 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2018-11-07 16:50:04,588 WARN L179 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 195 DAG size of output: 8 [2018-11-07 16:50:04,771 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 9 [2018-11-07 16:50:04,954 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 16:50:05,146 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 16:50:05,336 WARN L179 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 16:50:05,531 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 16:50:05,722 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 16:50:05,920 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 16:50:06,120 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 16:50:06,323 WARN L179 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 16:50:06,521 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 16:50:06,723 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 16:50:06,917 WARN L179 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 16:50:07,125 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 16:50:07,347 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 16:50:07,554 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 16:50:07,761 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 16:50:07,965 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 16:50:08,168 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 16:50:08,371 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 16:50:08,780 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 16:50:11,439 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 11 [2018-11-07 16:50:15,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:15,814 INFO L93 Difference]: Finished difference Result 219 states and 221 transitions. [2018-11-07 16:50:15,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-11-07 16:50:15,815 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 204 [2018-11-07 16:50:15,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:15,816 INFO L225 Difference]: With dead ends: 219 [2018-11-07 16:50:15,816 INFO L226 Difference]: Without dead ends: 214 [2018-11-07 16:50:15,818 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 541 GetRequests, 341 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2598 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=15097, Invalid=24703, Unknown=0, NotChecked=0, Total=39800 [2018-11-07 16:50:15,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-11-07 16:50:15,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 214. [2018-11-07 16:50:15,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-11-07 16:50:15,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 214 transitions. [2018-11-07 16:50:15,826 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 214 transitions. Word has length 204 [2018-11-07 16:50:15,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:15,826 INFO L480 AbstractCegarLoop]: Abstraction has 214 states and 214 transitions. [2018-11-07 16:50:15,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-11-07 16:50:15,826 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 214 transitions. [2018-11-07 16:50:15,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-11-07 16:50:15,827 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:15,828 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:15,828 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:15,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:15,828 INFO L82 PathProgramCache]: Analyzing trace with hash 385681027, now seen corresponding path program 23 times [2018-11-07 16:50:15,828 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:15,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:15,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:15,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:15,829 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:16,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:19,161 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:19,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:19,162 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:19,162 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:19,162 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:19,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:19,162 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:19,170 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:50:19,170 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:50:19,293 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 68 check-sat command(s) [2018-11-07 16:50:19,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:19,300 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:19,527 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:19,527 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:26,172 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:26,192 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:26,192 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-11-07 16:50:26,192 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:26,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-11-07 16:50:26,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-11-07 16:50:26,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7049, Invalid=12411, Unknown=0, NotChecked=0, Total=19460 [2018-11-07 16:50:26,194 INFO L87 Difference]: Start difference. First operand 214 states and 214 transitions. Second operand 73 states. [2018-11-07 16:50:26,531 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 201 DAG size of output: 8 [2018-11-07 16:50:26,703 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 204 DAG size of output: 8 [2018-11-07 16:50:26,897 WARN L179 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 9 [2018-11-07 16:50:27,099 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-07 16:50:27,308 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-07 16:50:27,511 WARN L179 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-07 16:50:27,735 WARN L179 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 16:50:27,974 WARN L179 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 16:50:28,188 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 16:50:28,399 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 16:50:28,619 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 16:50:28,834 WARN L179 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 16:50:29,049 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 16:50:29,265 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 16:50:29,482 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 16:50:29,702 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 16:50:29,987 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 16:50:31,120 WARN L179 SmtUtils]: Spent 626.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 16:50:31,334 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 16:50:31,553 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 16:50:31,765 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 16:50:31,983 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 16:50:32,200 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 16:50:32,415 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 16:50:32,630 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 16:50:32,934 WARN L179 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 16:50:40,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:40,497 INFO L93 Difference]: Finished difference Result 228 states and 230 transitions. [2018-11-07 16:50:40,500 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-11-07 16:50:40,501 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 213 [2018-11-07 16:50:40,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:40,502 INFO L225 Difference]: With dead ends: 228 [2018-11-07 16:50:40,502 INFO L226 Difference]: Without dead ends: 223 [2018-11-07 16:50:40,503 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 356 SyntacticMatches, 2 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2820 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=16507, Invalid=26965, Unknown=0, NotChecked=0, Total=43472 [2018-11-07 16:50:40,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-11-07 16:50:40,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 223. [2018-11-07 16:50:40,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2018-11-07 16:50:40,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 223 transitions. [2018-11-07 16:50:40,513 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 223 transitions. Word has length 213 [2018-11-07 16:50:40,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:40,513 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 223 transitions. [2018-11-07 16:50:40,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-11-07 16:50:40,514 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 223 transitions. [2018-11-07 16:50:40,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-11-07 16:50:40,515 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:40,515 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:40,515 INFO L423 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:40,515 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:40,515 INFO L82 PathProgramCache]: Analyzing trace with hash 1981222007, now seen corresponding path program 24 times [2018-11-07 16:50:40,516 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:40,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:40,516 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:40,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:40,516 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:40,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:43,777 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:43,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:43,777 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:43,777 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:43,778 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:43,778 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:43,778 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:43,787 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:50:43,788 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:50:44,048 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:50:44,048 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:44,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:44,515 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:44,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:51,704 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:51,724 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:51,725 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-11-07 16:50:51,725 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:51,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-11-07 16:50:51,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-11-07 16:50:51,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7679, Invalid=13491, Unknown=0, NotChecked=0, Total=21170 [2018-11-07 16:50:51,727 INFO L87 Difference]: Start difference. First operand 223 states and 223 transitions. Second operand 76 states. [2018-11-07 16:50:52,024 WARN L179 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 210 DAG size of output: 8 [2018-11-07 16:50:52,206 WARN L179 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 213 DAG size of output: 8 [2018-11-07 16:50:52,412 WARN L179 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 9 [2018-11-07 16:50:52,621 WARN L179 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-11-07 16:50:52,833 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-11-07 16:50:53,059 WARN L179 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-11-07 16:50:53,300 WARN L179 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-07 16:50:53,545 WARN L179 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-07 16:50:53,770 WARN L179 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-07 16:50:54,007 WARN L179 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 16:50:54,234 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 16:50:54,462 WARN L179 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 16:50:54,695 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 16:50:54,923 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 16:50:55,154 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 16:50:55,387 WARN L179 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 16:50:55,613 WARN L179 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 16:50:55,839 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 16:50:56,090 WARN L179 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 16:50:56,320 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 16:50:56,546 WARN L179 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 16:50:56,778 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 16:50:57,003 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 16:50:57,231 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 16:50:57,459 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 16:50:57,690 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 16:50:57,919 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 [2018-11-07 16:50:58,146 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2018-11-07 16:50:58,370 WARN L179 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 143 DAG size of output: 11 [2018-11-07 16:50:58,606 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 11 [2018-11-07 16:51:05,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:51:05,972 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-11-07 16:51:05,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-11-07 16:51:05,973 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 222 [2018-11-07 16:51:05,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:51:05,975 INFO L225 Difference]: With dead ends: 237 [2018-11-07 16:51:05,975 INFO L226 Difference]: Without dead ends: 232 [2018-11-07 16:51:05,977 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 589 GetRequests, 371 SyntacticMatches, 2 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3051 ImplicationChecksByTransitivity, 23.8s TimeCoverageRelationStatistics Valid=17980, Invalid=29326, Unknown=0, NotChecked=0, Total=47306 [2018-11-07 16:51:05,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2018-11-07 16:51:05,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2018-11-07 16:51:05,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-11-07 16:51:05,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 232 transitions. [2018-11-07 16:51:05,987 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 232 transitions. Word has length 222 [2018-11-07 16:51:05,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:51:05,988 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 232 transitions. [2018-11-07 16:51:05,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-11-07 16:51:05,988 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 232 transitions. [2018-11-07 16:51:05,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-11-07 16:51:05,989 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:51:05,989 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:51:05,989 INFO L423 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:51:05,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:51:05,991 INFO L82 PathProgramCache]: Analyzing trace with hash -1183680253, now seen corresponding path program 25 times [2018-11-07 16:51:05,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:51:05,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:51:05,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:51:05,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:51:05,992 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:51:06,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:51:09,887 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:51:09,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:51:09,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:51:09,887 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:51:09,887 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:51:09,887 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:51:09,887 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:51:09,896 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:51:09,896 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:51:10,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:51:10,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:51:10,737 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:51:10,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:51:18,372 INFO L134 CoverageAnalysis]: Checked inductivity of 8030 backedges. 0 proven. 8030 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:51:18,392 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:51:18,392 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 152 [2018-11-07 16:51:18,392 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:51:18,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-11-07 16:51:18,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-11-07 16:51:18,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8336, Invalid=14616, Unknown=0, NotChecked=0, Total=22952 [2018-11-07 16:51:18,394 INFO L87 Difference]: Start difference. First operand 232 states and 232 transitions. Second operand 79 states. [2018-11-07 16:51:18,665 WARN L179 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 219 DAG size of output: 8 [2018-11-07 16:51:18,870 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 222 DAG size of output: 8 [2018-11-07 16:51:19,129 WARN L179 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 228 DAG size of output: 9 [2018-11-07 16:51:19,359 WARN L179 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 227 DAG size of output: 11 [2018-11-07 16:51:19,582 WARN L179 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 224 DAG size of output: 11 [2018-11-07 16:51:19,812 WARN L179 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2018-11-07 16:51:20,059 WARN L179 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2018-11-07 16:51:20,295 WARN L179 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 215 DAG size of output: 11 [2018-11-07 16:51:20,530 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 212 DAG size of output: 11 [2018-11-07 16:51:20,768 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 11 [2018-11-07 16:51:21,015 WARN L179 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2018-11-07 16:51:21,255 WARN L179 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 203 DAG size of output: 11 [2018-11-07 16:51:21,500 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 200 DAG size of output: 11 [2018-11-07 16:51:21,793 WARN L179 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 197 DAG size of output: 11 [2018-11-07 16:51:22,036 WARN L179 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 11 [2018-11-07 16:51:22,283 WARN L179 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2018-11-07 16:51:22,531 WARN L179 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 188 DAG size of output: 11 [2018-11-07 16:51:22,784 WARN L179 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 185 DAG size of output: 11 [2018-11-07 16:51:23,033 WARN L179 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 182 DAG size of output: 11 [2018-11-07 16:51:23,282 WARN L179 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 179 DAG size of output: 11 [2018-11-07 16:51:23,530 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2018-11-07 16:51:23,779 WARN L179 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 173 DAG size of output: 11 [2018-11-07 16:51:24,036 WARN L179 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 170 DAG size of output: 11 [2018-11-07 16:51:24,285 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 11 [2018-11-07 16:51:24,523 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 11 [2018-11-07 16:51:24,765 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 11 [2018-11-07 16:51:25,015 WARN L179 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 11 [2018-11-07 16:51:25,255 WARN L179 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 155 DAG size of output: 11 [2018-11-07 16:51:25,496 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 11 [2018-11-07 16:51:25,736 WARN L179 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 149 DAG size of output: 11 Received shutdown request... [2018-11-07 16:51:25,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 16:51:25,755 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 16:51:25,759 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 16:51:25,759 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 04:51:25 BoogieIcfgContainer [2018-11-07 16:51:25,759 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 16:51:25,760 INFO L168 Benchmark]: Toolchain (without parser) took 246486.74 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 654.3 MB). Free memory was 1.4 GB in the beginning and 1.9 GB in the end (delta: -473.0 MB). Peak memory consumption was 181.3 MB. Max. memory is 7.1 GB. [2018-11-07 16:51:25,761 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:51:25,761 INFO L168 Benchmark]: CACSL2BoogieTranslator took 321.45 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-07 16:51:25,761 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.17 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:51:25,761 INFO L168 Benchmark]: Boogie Preprocessor took 18.81 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:51:25,762 INFO L168 Benchmark]: RCFGBuilder took 354.95 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 715.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -764.6 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-11-07 16:51:25,762 INFO L168 Benchmark]: TraceAbstraction took 245762.66 ms. Allocated memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -60.8 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 281.0 MB). Peak memory consumption was 220.2 MB. Max. memory is 7.1 GB. [2018-11-07 16:51:25,765 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 321.45 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.17 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 18.81 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 354.95 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 715.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -764.6 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 245762.66 ms. Allocated memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: -60.8 MB). Free memory was 2.2 GB in the beginning and 1.9 GB in the end (delta: 281.0 MB). Peak memory consumption was 220.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was constructing difference of abstraction (232states) and FLOYD_HOARE automaton (currently 32 states, 79 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 182 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 245.6s OverallTime, 27 OverallIterations, 74 TraceHistogramMax, 123.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 352 SDtfs, 3868 SDslu, 8676 SDs, 0 SdLazy, 4049 SolverSat, 2421 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 6.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8088 GetRequests, 5154 SyntacticMatches, 50 SemanticMatches, 2883 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28493 ImplicationChecksByTransitivity, 224.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=232occurred in iteration=26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 26 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 5.3s SatisfiabilityAnalysisTime, 114.3s InterpolantComputationTime, 6173 NumberOfCodeBlocks, 6173 NumberOfCodeBlocksAsserted, 344 NumberOfCheckSat, 9171 ConstructedInterpolants, 74 QuantifiedInterpolants, 8659439 SizeOfPredicates, 75 NumberOfNonLiveVariables, 4425 ConjunctsInSsa, 1000 ConjunctsInUnsatCore, 77 InterpolantComputations, 2 PerfectInterpolantSequences, 0/208050 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown