java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono6_false-unreach-call1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-b6335f6 [2018-10-23 10:09:50,504 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-23 10:09:50,507 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-23 10:09:50,523 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-23 10:09:50,524 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-23 10:09:50,525 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-23 10:09:50,528 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-23 10:09:50,531 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-23 10:09:50,533 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-23 10:09:50,534 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-23 10:09:50,542 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-23 10:09:50,542 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-23 10:09:50,543 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-23 10:09:50,545 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-23 10:09:50,546 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-23 10:09:50,549 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-23 10:09:50,550 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-23 10:09:50,552 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-23 10:09:50,556 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-23 10:09:50,557 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-23 10:09:50,561 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-23 10:09:50,562 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-23 10:09:50,567 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-23 10:09:50,567 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-23 10:09:50,567 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-23 10:09:50,569 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-23 10:09:50,570 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-23 10:09:50,571 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-23 10:09:50,571 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-23 10:09:50,572 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-23 10:09:50,573 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-23 10:09:50,576 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-23 10:09:50,576 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-23 10:09:50,576 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-23 10:09:50,577 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-23 10:09:50,577 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-23 10:09:50,578 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-23 10:09:50,593 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-23 10:09:50,594 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-23 10:09:50,595 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-23 10:09:50,595 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-23 10:09:50,595 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-23 10:09:50,595 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-23 10:09:50,595 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-23 10:09:50,596 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-23 10:09:50,596 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-23 10:09:50,596 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-23 10:09:50,596 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-23 10:09:50,596 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-23 10:09:50,597 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-23 10:09:50,597 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-23 10:09:50,597 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-23 10:09:50,598 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-23 10:09:50,598 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-23 10:09:50,598 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-23 10:09:50,598 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-23 10:09:50,598 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-23 10:09:50,599 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-23 10:09:50,599 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-23 10:09:50,599 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-23 10:09:50,599 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-23 10:09:50,599 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 10:09:50,600 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-23 10:09:50,600 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-23 10:09:50,600 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-23 10:09:50,600 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-23 10:09:50,600 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-23 10:09:50,601 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-23 10:09:50,601 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-23 10:09:50,601 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-23 10:09:50,601 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-23 10:09:50,642 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-23 10:09:50,655 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-23 10:09:50,658 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-23 10:09:50,660 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-23 10:09:50,661 INFO L276 PluginConnector]: CDTParser initialized [2018-10-23 10:09:50,661 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono6_false-unreach-call1.c [2018-10-23 10:09:50,725 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/30b6183a5/62dcb96729a64c97bffe41d8c514080f/FLAG944672a39 [2018-10-23 10:09:51,151 INFO L298 CDTParser]: Found 1 translation units. [2018-10-23 10:09:51,152 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono6_false-unreach-call1.c [2018-10-23 10:09:51,160 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/30b6183a5/62dcb96729a64c97bffe41d8c514080f/FLAG944672a39 [2018-10-23 10:09:51,176 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/30b6183a5/62dcb96729a64c97bffe41d8c514080f [2018-10-23 10:09:51,187 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-23 10:09:51,188 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-23 10:09:51,190 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-23 10:09:51,190 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-23 10:09:51,195 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-23 10:09:51,197 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,200 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42eff4c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51, skipping insertion in model container [2018-10-23 10:09:51,200 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,211 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-23 10:09:51,235 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-23 10:09:51,461 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 10:09:51,464 INFO L189 MainTranslator]: Completed pre-run [2018-10-23 10:09:51,485 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-23 10:09:51,504 INFO L193 MainTranslator]: Completed translation [2018-10-23 10:09:51,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51 WrapperNode [2018-10-23 10:09:51,505 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-23 10:09:51,506 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-23 10:09:51,506 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-23 10:09:51,506 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-23 10:09:51,517 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,523 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,530 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-23 10:09:51,531 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-23 10:09:51,531 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-23 10:09:51,531 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-23 10:09:51,541 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,542 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,542 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,543 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,547 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,552 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,553 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... [2018-10-23 10:09:51,557 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-23 10:09:51,558 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-23 10:09:51,558 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-23 10:09:51,558 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-23 10:09:51,559 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-23 10:09:51,692 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-23 10:09:51,692 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-23 10:09:51,692 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-23 10:09:51,692 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-23 10:09:51,692 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-23 10:09:51,693 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-23 10:09:51,693 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-23 10:09:51,693 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-23 10:09:51,919 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-23 10:09:51,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:09:51 BoogieIcfgContainer [2018-10-23 10:09:51,923 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-23 10:09:51,924 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-23 10:09:51,924 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-23 10:09:51,938 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-23 10:09:51,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 10:09:51" (1/3) ... [2018-10-23 10:09:51,940 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18e70384 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:09:51, skipping insertion in model container [2018-10-23 10:09:51,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 10:09:51" (2/3) ... [2018-10-23 10:09:51,941 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18e70384 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 10:09:51, skipping insertion in model container [2018-10-23 10:09:51,942 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 10:09:51" (3/3) ... [2018-10-23 10:09:51,944 INFO L112 eAbstractionObserver]: Analyzing ICFG Mono6_false-unreach-call1.c [2018-10-23 10:09:51,960 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-23 10:09:51,970 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-23 10:09:51,991 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-23 10:09:52,061 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-23 10:09:52,061 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-23 10:09:52,062 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-23 10:09:52,062 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-23 10:09:52,062 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-23 10:09:52,062 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-23 10:09:52,062 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-23 10:09:52,062 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-23 10:09:52,087 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-23 10:09:52,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-23 10:09:52,093 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:52,094 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:52,097 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:52,103 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:52,103 INFO L82 PathProgramCache]: Analyzing trace with hash -2008095039, now seen corresponding path program 1 times [2018-10-23 10:09:52,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:52,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:52,159 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:09:52,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:52,160 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:52,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:52,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:52,233 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 10:09:52,234 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-23 10:09:52,234 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 10:09:52,238 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-23 10:09:52,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-23 10:09:52,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 10:09:52,253 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-23 10:09:52,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:09:52,274 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-23 10:09:52,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-23 10:09:52,275 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-23 10:09:52,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:09:52,284 INFO L225 Difference]: With dead ends: 33 [2018-10-23 10:09:52,284 INFO L226 Difference]: Without dead ends: 14 [2018-10-23 10:09:52,288 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-23 10:09:52,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-23 10:09:52,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-23 10:09:52,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-23 10:09:52,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-10-23 10:09:52,328 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-10-23 10:09:52,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:09:52,328 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-10-23 10:09:52,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-23 10:09:52,329 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-10-23 10:09:52,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-23 10:09:52,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:52,330 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:52,330 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:52,331 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:52,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1715940768, now seen corresponding path program 1 times [2018-10-23 10:09:52,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:52,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:52,333 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:09:52,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:52,333 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:52,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:52,613 WARN L179 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-23 10:09:52,686 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:52,686 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-23 10:09:52,687 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-23 10:09:52,687 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 10:09:52,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-23 10:09:52,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-23 10:09:52,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-23 10:09:52,689 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2018-10-23 10:09:52,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:09:52,753 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-10-23 10:09:52,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-23 10:09:52,754 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-23 10:09:52,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:09:52,755 INFO L225 Difference]: With dead ends: 27 [2018-10-23 10:09:52,755 INFO L226 Difference]: Without dead ends: 18 [2018-10-23 10:09:52,757 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-23 10:09:52,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-23 10:09:52,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-23 10:09:52,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-23 10:09:52,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-10-23 10:09:52,766 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-10-23 10:09:52,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:09:52,766 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-10-23 10:09:52,767 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-23 10:09:52,767 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-10-23 10:09:52,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-23 10:09:52,767 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:52,768 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:52,768 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:52,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:52,768 INFO L82 PathProgramCache]: Analyzing trace with hash 1048902920, now seen corresponding path program 1 times [2018-10-23 10:09:52,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:52,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:52,770 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:09:52,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:52,770 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:52,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:53,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:53,002 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:53,003 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:09:53,004 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-10-23 10:09:53,007 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [21], [28], [31], [33], [39], [40], [41], [43] [2018-10-23 10:09:53,071 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 10:09:53,072 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 10:09:53,203 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-23 10:09:53,780 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-23 10:09:53,782 INFO L272 AbstractInterpreter]: Visited 14 different actions 270 times. Merged at 5 different actions 148 times. Widened at 1 different actions 26 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-23 10:09:53,810 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:53,812 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-23 10:09:53,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:53,812 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:09:53,830 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:09:53,830 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:09:53,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:53,859 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:09:54,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:54,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:09:54,235 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:54,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:09:54,258 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 9 [2018-10-23 10:09:54,258 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:09:54,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 10:09:54,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 10:09:54,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-10-23 10:09:54,260 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 7 states. [2018-10-23 10:09:54,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:09:54,329 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-10-23 10:09:54,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-23 10:09:54,330 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-10-23 10:09:54,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:09:54,331 INFO L225 Difference]: With dead ends: 31 [2018-10-23 10:09:54,331 INFO L226 Difference]: Without dead ends: 22 [2018-10-23 10:09:54,331 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-10-23 10:09:54,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-23 10:09:54,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-23 10:09:54,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-23 10:09:54,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-23 10:09:54,337 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-10-23 10:09:54,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:09:54,337 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-23 10:09:54,337 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 10:09:54,338 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-23 10:09:54,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-23 10:09:54,338 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:54,339 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:54,339 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:54,339 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:54,339 INFO L82 PathProgramCache]: Analyzing trace with hash 452778096, now seen corresponding path program 2 times [2018-10-23 10:09:54,340 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:54,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:54,341 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:09:54,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:54,341 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:54,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:54,604 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:54,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:54,605 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:09:54,606 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:09:54,606 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:09:54,607 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:54,607 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:09:54,621 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:09:54,622 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:09:54,643 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2018-10-23 10:09:54,644 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:09:54,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:09:54,941 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-23 10:09:54,942 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:09:55,126 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-10-23 10:09:55,150 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-23 10:09:55,150 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [6] total 14 [2018-10-23 10:09:55,150 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-23 10:09:55,150 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-23 10:09:55,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-23 10:09:55,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2018-10-23 10:09:55,151 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-10-23 10:09:55,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:09:55,581 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-10-23 10:09:55,583 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 10:09:55,583 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-23 10:09:55,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:09:55,584 INFO L225 Difference]: With dead ends: 30 [2018-10-23 10:09:55,585 INFO L226 Difference]: Without dead ends: 25 [2018-10-23 10:09:55,586 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2018-10-23 10:09:55,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-23 10:09:55,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-23 10:09:55,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-23 10:09:55,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-10-23 10:09:55,591 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 19 [2018-10-23 10:09:55,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:09:55,591 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-10-23 10:09:55,591 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-23 10:09:55,592 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-10-23 10:09:55,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-23 10:09:55,592 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:55,593 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:55,593 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:55,593 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:55,593 INFO L82 PathProgramCache]: Analyzing trace with hash 671507994, now seen corresponding path program 1 times [2018-10-23 10:09:55,594 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:55,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:55,595 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:09:55,595 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:55,595 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:55,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:55,844 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:55,844 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:55,844 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:09:55,845 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-10-23 10:09:55,845 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [21], [28], [31], [33], [39], [40], [41], [43] [2018-10-23 10:09:55,848 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-23 10:09:55,848 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-23 10:09:55,860 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-23 10:09:56,468 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-23 10:09:56,469 INFO L272 AbstractInterpreter]: Visited 15 different actions 392 times. Merged at 6 different actions 207 times. Widened at 1 different actions 32 times. Found 36 fixpoints after 3 different actions. Largest state had 5 variables. [2018-10-23 10:09:56,507 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:56,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-23 10:09:56,508 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:56,508 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:09:56,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:09:56,516 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:09:56,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:56,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:09:56,572 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:56,574 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:09:56,730 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:56,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:09:56,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 9 [2018-10-23 10:09:56,751 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:09:56,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-23 10:09:56,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-23 10:09:56,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-10-23 10:09:56,752 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 6 states. [2018-10-23 10:09:56,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:09:56,833 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2018-10-23 10:09:56,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-23 10:09:56,834 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2018-10-23 10:09:56,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:09:56,836 INFO L225 Difference]: With dead ends: 39 [2018-10-23 10:09:56,836 INFO L226 Difference]: Without dead ends: 30 [2018-10-23 10:09:56,837 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-10-23 10:09:56,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-23 10:09:56,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-23 10:09:56,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-23 10:09:56,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-10-23 10:09:56,842 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 23 [2018-10-23 10:09:56,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:09:56,843 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-10-23 10:09:56,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-23 10:09:56,843 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-10-23 10:09:56,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-23 10:09:56,844 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:56,844 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:56,844 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:56,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:56,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1681938818, now seen corresponding path program 2 times [2018-10-23 10:09:56,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:56,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:56,846 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:09:56,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:56,846 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:56,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:57,071 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-10-23 10:09:57,089 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:57,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:57,090 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:09:57,090 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:09:57,090 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:09:57,090 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:57,090 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:09:57,098 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:09:57,098 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:09:57,112 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:09:57,112 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:09:57,114 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:09:57,127 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:57,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:09:57,394 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:57,414 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:09:57,414 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 11 [2018-10-23 10:09:57,415 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:09:57,415 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-23 10:09:57,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-23 10:09:57,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2018-10-23 10:09:57,416 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 7 states. [2018-10-23 10:09:57,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:09:57,517 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2018-10-23 10:09:57,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-23 10:09:57,519 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2018-10-23 10:09:57,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:09:57,519 INFO L225 Difference]: With dead ends: 43 [2018-10-23 10:09:57,520 INFO L226 Difference]: Without dead ends: 34 [2018-10-23 10:09:57,520 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2018-10-23 10:09:57,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-23 10:09:57,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-23 10:09:57,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-23 10:09:57,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-23 10:09:57,526 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 27 [2018-10-23 10:09:57,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:09:57,527 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-23 10:09:57,527 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-23 10:09:57,527 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-23 10:09:57,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-23 10:09:57,528 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:57,528 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:57,528 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:57,528 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:57,528 INFO L82 PathProgramCache]: Analyzing trace with hash 1107450090, now seen corresponding path program 3 times [2018-10-23 10:09:57,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:57,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:57,530 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:09:57,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:57,530 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:57,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:57,757 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 14 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:57,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:57,757 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:09:57,757 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:09:57,758 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:09:57,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:57,758 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:09:57,776 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:09:57,776 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:09:57,793 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:09:57,793 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:09:57,795 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:09:57,815 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 14 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:57,816 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:09:57,951 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 14 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:57,973 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:09:57,973 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 13 [2018-10-23 10:09:57,973 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:09:57,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-23 10:09:57,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-23 10:09:57,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=98, Unknown=0, NotChecked=0, Total=156 [2018-10-23 10:09:57,975 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 8 states. [2018-10-23 10:09:58,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:09:58,175 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2018-10-23 10:09:58,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-23 10:09:58,178 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2018-10-23 10:09:58,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:09:58,179 INFO L225 Difference]: With dead ends: 47 [2018-10-23 10:09:58,179 INFO L226 Difference]: Without dead ends: 38 [2018-10-23 10:09:58,180 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=98, Unknown=0, NotChecked=0, Total=156 [2018-10-23 10:09:58,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-23 10:09:58,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2018-10-23 10:09:58,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-23 10:09:58,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2018-10-23 10:09:58,184 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 31 [2018-10-23 10:09:58,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:09:58,185 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2018-10-23 10:09:58,186 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-23 10:09:58,186 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2018-10-23 10:09:58,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-23 10:09:58,187 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:58,187 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:58,188 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:58,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:58,190 INFO L82 PathProgramCache]: Analyzing trace with hash 1717986386, now seen corresponding path program 4 times [2018-10-23 10:09:58,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:58,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:58,191 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:09:58,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:58,192 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:58,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:58,404 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 17 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:58,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:58,404 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:09:58,404 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:09:58,405 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:09:58,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:58,405 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:09:58,415 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:09:58,416 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:09:58,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:58,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:09:58,446 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 17 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:58,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:09:58,591 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 17 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:58,611 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:09:58,611 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 15 [2018-10-23 10:09:58,611 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:09:58,612 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-23 10:09:58,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-23 10:09:58,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2018-10-23 10:09:58,613 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 9 states. [2018-10-23 10:09:58,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:09:58,791 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2018-10-23 10:09:58,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-23 10:09:58,792 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2018-10-23 10:09:58,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:09:58,794 INFO L225 Difference]: With dead ends: 51 [2018-10-23 10:09:58,794 INFO L226 Difference]: Without dead ends: 42 [2018-10-23 10:09:58,795 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2018-10-23 10:09:58,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-23 10:09:58,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2018-10-23 10:09:58,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-23 10:09:58,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2018-10-23 10:09:58,800 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 35 [2018-10-23 10:09:58,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:09:58,801 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2018-10-23 10:09:58,801 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-23 10:09:58,801 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2018-10-23 10:09:58,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-23 10:09:58,802 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:58,802 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:58,803 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:58,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:58,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1501985722, now seen corresponding path program 5 times [2018-10-23 10:09:58,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:58,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:58,804 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:09:58,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:58,805 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:58,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:59,047 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 20 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:59,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:59,048 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:09:59,048 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:09:59,048 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:09:59,048 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:59,048 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:09:59,056 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:09:59,056 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:09:59,074 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:09:59,074 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:09:59,077 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:09:59,094 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 20 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:59,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:09:59,361 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 20 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:59,381 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:09:59,381 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 17 [2018-10-23 10:09:59,381 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:09:59,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-23 10:09:59,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-23 10:09:59,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2018-10-23 10:09:59,383 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 10 states. [2018-10-23 10:09:59,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:09:59,705 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2018-10-23 10:09:59,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-23 10:09:59,705 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2018-10-23 10:09:59,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:09:59,707 INFO L225 Difference]: With dead ends: 55 [2018-10-23 10:09:59,707 INFO L226 Difference]: Without dead ends: 46 [2018-10-23 10:09:59,709 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2018-10-23 10:09:59,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-23 10:09:59,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-23 10:09:59,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-23 10:09:59,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2018-10-23 10:09:59,715 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 39 [2018-10-23 10:09:59,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:09:59,716 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2018-10-23 10:09:59,716 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-23 10:09:59,716 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2018-10-23 10:09:59,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-23 10:09:59,717 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:09:59,717 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:09:59,717 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:09:59,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:09:59,718 INFO L82 PathProgramCache]: Analyzing trace with hash 108830498, now seen corresponding path program 6 times [2018-10-23 10:09:59,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:09:59,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:59,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:09:59,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:09:59,719 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:09:59,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:09:59,916 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 23 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:59,916 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:59,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:09:59,917 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:09:59,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:09:59,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:09:59,917 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:09:59,927 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:09:59,927 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:09:59,942 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:09:59,943 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:09:59,945 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:09:59,978 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 23 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:09:59,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:00,253 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 23 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:00,275 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:00,275 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 19 [2018-10-23 10:10:00,275 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:00,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-23 10:10:00,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-23 10:10:00,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2018-10-23 10:10:00,277 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 11 states. [2018-10-23 10:10:00,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:00,519 INFO L93 Difference]: Finished difference Result 59 states and 63 transitions. [2018-10-23 10:10:00,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-23 10:10:00,519 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 43 [2018-10-23 10:10:00,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:00,520 INFO L225 Difference]: With dead ends: 59 [2018-10-23 10:10:00,520 INFO L226 Difference]: Without dead ends: 50 [2018-10-23 10:10:00,521 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=227, Unknown=0, NotChecked=0, Total=342 [2018-10-23 10:10:00,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-23 10:10:00,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2018-10-23 10:10:00,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-23 10:10:00,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2018-10-23 10:10:00,527 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 43 [2018-10-23 10:10:00,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:00,527 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2018-10-23 10:10:00,528 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-23 10:10:00,528 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2018-10-23 10:10:00,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-23 10:10:00,529 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:00,529 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:00,529 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:00,529 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:00,530 INFO L82 PathProgramCache]: Analyzing trace with hash 996331146, now seen corresponding path program 7 times [2018-10-23 10:10:00,530 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:00,530 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:00,531 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:00,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:00,531 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:00,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:00,962 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 26 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:00,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:00,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:00,962 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:00,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:00,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:00,963 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:00,970 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:00,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:00,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:00,987 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:01,007 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 26 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:01,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:02,106 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 26 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:02,145 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:02,145 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 21 [2018-10-23 10:10:02,145 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:02,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-23 10:10:02,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-23 10:10:02,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=282, Unknown=0, NotChecked=0, Total=420 [2018-10-23 10:10:02,148 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 12 states. [2018-10-23 10:10:03,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:03,632 INFO L93 Difference]: Finished difference Result 63 states and 67 transitions. [2018-10-23 10:10:03,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-23 10:10:03,636 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 47 [2018-10-23 10:10:03,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:03,637 INFO L225 Difference]: With dead ends: 63 [2018-10-23 10:10:03,637 INFO L226 Difference]: Without dead ends: 54 [2018-10-23 10:10:03,638 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=282, Unknown=0, NotChecked=0, Total=420 [2018-10-23 10:10:03,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-23 10:10:03,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-10-23 10:10:03,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-10-23 10:10:03,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2018-10-23 10:10:03,643 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 47 [2018-10-23 10:10:03,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:03,643 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2018-10-23 10:10:03,644 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-23 10:10:03,644 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2018-10-23 10:10:03,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-23 10:10:03,645 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:03,645 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:03,645 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:03,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:03,645 INFO L82 PathProgramCache]: Analyzing trace with hash 693307890, now seen corresponding path program 8 times [2018-10-23 10:10:03,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:03,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:03,646 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:03,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:03,647 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:03,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:03,922 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 29 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:03,922 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:03,922 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:03,922 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:03,922 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:03,923 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:03,923 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:03,931 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:03,931 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:03,955 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:03,955 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:03,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:03,984 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 29 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:03,985 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:04,350 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 29 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:04,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:04,371 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 23 [2018-10-23 10:10:04,371 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:04,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-23 10:10:04,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-23 10:10:04,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=343, Unknown=0, NotChecked=0, Total=506 [2018-10-23 10:10:04,372 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 13 states. [2018-10-23 10:10:04,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:04,780 INFO L93 Difference]: Finished difference Result 67 states and 71 transitions. [2018-10-23 10:10:04,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-23 10:10:04,782 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 51 [2018-10-23 10:10:04,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:04,783 INFO L225 Difference]: With dead ends: 67 [2018-10-23 10:10:04,783 INFO L226 Difference]: Without dead ends: 58 [2018-10-23 10:10:04,784 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=163, Invalid=343, Unknown=0, NotChecked=0, Total=506 [2018-10-23 10:10:04,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-23 10:10:04,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-23 10:10:04,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-23 10:10:04,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2018-10-23 10:10:04,790 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 51 [2018-10-23 10:10:04,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:04,791 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2018-10-23 10:10:04,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-23 10:10:04,791 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2018-10-23 10:10:04,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-23 10:10:04,792 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:04,792 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:04,793 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:04,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:04,793 INFO L82 PathProgramCache]: Analyzing trace with hash -462991014, now seen corresponding path program 9 times [2018-10-23 10:10:04,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:04,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:04,794 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:04,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:04,795 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:04,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:05,072 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 32 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:05,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:05,072 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:05,073 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:05,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:05,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:05,073 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:05,090 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:05,090 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:05,127 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:05,127 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:05,130 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:05,162 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 32 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:05,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:05,712 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 32 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:05,732 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:05,733 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 25 [2018-10-23 10:10:05,733 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:05,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-23 10:10:05,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-23 10:10:05,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=410, Unknown=0, NotChecked=0, Total=600 [2018-10-23 10:10:05,734 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 14 states. [2018-10-23 10:10:06,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:06,051 INFO L93 Difference]: Finished difference Result 71 states and 75 transitions. [2018-10-23 10:10:06,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-23 10:10:06,051 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 55 [2018-10-23 10:10:06,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:06,052 INFO L225 Difference]: With dead ends: 71 [2018-10-23 10:10:06,053 INFO L226 Difference]: Without dead ends: 62 [2018-10-23 10:10:06,054 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=190, Invalid=410, Unknown=0, NotChecked=0, Total=600 [2018-10-23 10:10:06,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-23 10:10:06,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2018-10-23 10:10:06,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-23 10:10:06,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2018-10-23 10:10:06,060 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 55 [2018-10-23 10:10:06,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:06,061 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2018-10-23 10:10:06,061 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-23 10:10:06,061 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2018-10-23 10:10:06,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-23 10:10:06,062 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:06,062 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:06,062 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:06,063 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:06,063 INFO L82 PathProgramCache]: Analyzing trace with hash -474372926, now seen corresponding path program 10 times [2018-10-23 10:10:06,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:06,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:06,064 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:06,064 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:06,064 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:06,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:06,699 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 35 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:06,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:06,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:06,699 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:06,699 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:06,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:06,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:06,708 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:06,708 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:06,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:06,730 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:06,761 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 35 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:06,762 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:07,264 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 35 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:07,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:07,292 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 27 [2018-10-23 10:10:07,293 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:07,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-23 10:10:07,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-23 10:10:07,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=483, Unknown=0, NotChecked=0, Total=702 [2018-10-23 10:10:07,294 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand 15 states. [2018-10-23 10:10:07,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:07,768 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2018-10-23 10:10:07,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-23 10:10:07,771 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 59 [2018-10-23 10:10:07,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:07,771 INFO L225 Difference]: With dead ends: 75 [2018-10-23 10:10:07,771 INFO L226 Difference]: Without dead ends: 66 [2018-10-23 10:10:07,772 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=219, Invalid=483, Unknown=0, NotChecked=0, Total=702 [2018-10-23 10:10:07,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-23 10:10:07,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2018-10-23 10:10:07,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-10-23 10:10:07,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2018-10-23 10:10:07,779 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 59 [2018-10-23 10:10:07,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:07,780 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2018-10-23 10:10:07,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-23 10:10:07,780 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2018-10-23 10:10:07,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-23 10:10:07,781 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:07,781 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:07,781 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:07,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:07,782 INFO L82 PathProgramCache]: Analyzing trace with hash -2124151766, now seen corresponding path program 11 times [2018-10-23 10:10:07,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:07,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:07,783 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:07,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:07,783 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:07,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:08,420 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 38 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:08,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:08,421 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:08,421 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:08,421 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:08,421 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:08,421 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:08,428 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:08,429 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:08,445 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:08,445 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:08,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:08,511 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 38 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:08,511 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:09,100 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 38 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:09,121 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:09,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 29 [2018-10-23 10:10:09,122 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:09,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-23 10:10:09,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-23 10:10:09,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2018-10-23 10:10:09,123 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 16 states. [2018-10-23 10:10:09,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:09,664 INFO L93 Difference]: Finished difference Result 79 states and 83 transitions. [2018-10-23 10:10:09,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-23 10:10:09,665 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2018-10-23 10:10:09,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:09,666 INFO L225 Difference]: With dead ends: 79 [2018-10-23 10:10:09,666 INFO L226 Difference]: Without dead ends: 70 [2018-10-23 10:10:09,667 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2018-10-23 10:10:09,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-23 10:10:09,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-23 10:10:09,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-23 10:10:09,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2018-10-23 10:10:09,674 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 63 [2018-10-23 10:10:09,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:09,675 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2018-10-23 10:10:09,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-23 10:10:09,675 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2018-10-23 10:10:09,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-23 10:10:09,676 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:09,676 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:09,677 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:09,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:09,677 INFO L82 PathProgramCache]: Analyzing trace with hash 2055237522, now seen corresponding path program 12 times [2018-10-23 10:10:09,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:09,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:09,678 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:09,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:09,678 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:09,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:10,178 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 41 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:10,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:10,178 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:10,178 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:10,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:10,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:10,179 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:10,190 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:10,191 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:10,222 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:10,222 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:10,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:10,253 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 41 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:10,253 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:10,937 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 41 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:10,957 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:10,957 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 31 [2018-10-23 10:10:10,958 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:10,958 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-23 10:10:10,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-23 10:10:10,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=647, Unknown=0, NotChecked=0, Total=930 [2018-10-23 10:10:10,959 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand 17 states. [2018-10-23 10:10:11,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:11,849 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2018-10-23 10:10:11,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-23 10:10:11,849 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 67 [2018-10-23 10:10:11,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:11,850 INFO L225 Difference]: With dead ends: 83 [2018-10-23 10:10:11,851 INFO L226 Difference]: Without dead ends: 74 [2018-10-23 10:10:11,852 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=283, Invalid=647, Unknown=0, NotChecked=0, Total=930 [2018-10-23 10:10:11,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-23 10:10:11,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2018-10-23 10:10:11,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-10-23 10:10:11,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2018-10-23 10:10:11,858 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 67 [2018-10-23 10:10:11,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:11,858 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2018-10-23 10:10:11,858 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-23 10:10:11,859 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2018-10-23 10:10:11,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-23 10:10:11,860 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:11,860 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:11,860 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:11,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:11,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1864951546, now seen corresponding path program 13 times [2018-10-23 10:10:11,861 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:11,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:11,861 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:11,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:11,862 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:11,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:12,212 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 44 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:12,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:12,212 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:12,213 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:12,213 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:12,213 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:12,213 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:12,220 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:12,220 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:12,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:12,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:12,279 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 44 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:12,280 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:13,027 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 44 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:13,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:13,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 33 [2018-10-23 10:10:13,048 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:13,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-23 10:10:13,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-23 10:10:13,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=738, Unknown=0, NotChecked=0, Total=1056 [2018-10-23 10:10:13,049 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 18 states. [2018-10-23 10:10:13,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:13,716 INFO L93 Difference]: Finished difference Result 87 states and 91 transitions. [2018-10-23 10:10:13,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-23 10:10:13,716 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 71 [2018-10-23 10:10:13,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:13,717 INFO L225 Difference]: With dead ends: 87 [2018-10-23 10:10:13,717 INFO L226 Difference]: Without dead ends: 78 [2018-10-23 10:10:13,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=318, Invalid=738, Unknown=0, NotChecked=0, Total=1056 [2018-10-23 10:10:13,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-10-23 10:10:13,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-10-23 10:10:13,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-23 10:10:13,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2018-10-23 10:10:13,724 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 71 [2018-10-23 10:10:13,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:13,725 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2018-10-23 10:10:13,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-23 10:10:13,725 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2018-10-23 10:10:13,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-23 10:10:13,726 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:13,726 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:13,727 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:13,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:13,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1651993186, now seen corresponding path program 14 times [2018-10-23 10:10:13,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:13,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:13,728 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:13,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:13,728 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:13,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:14,227 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 47 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:14,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:14,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:14,228 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:14,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:14,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:14,228 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:14,236 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:14,236 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:14,253 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:14,254 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:14,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:14,284 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 47 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:14,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:15,263 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 47 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:15,283 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:15,283 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 35 [2018-10-23 10:10:15,284 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:15,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-23 10:10:15,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-23 10:10:15,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=835, Unknown=0, NotChecked=0, Total=1190 [2018-10-23 10:10:15,285 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 19 states. [2018-10-23 10:10:15,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:15,823 INFO L93 Difference]: Finished difference Result 91 states and 95 transitions. [2018-10-23 10:10:15,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-23 10:10:15,824 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2018-10-23 10:10:15,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:15,825 INFO L225 Difference]: With dead ends: 91 [2018-10-23 10:10:15,825 INFO L226 Difference]: Without dead ends: 82 [2018-10-23 10:10:15,826 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=355, Invalid=835, Unknown=0, NotChecked=0, Total=1190 [2018-10-23 10:10:15,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-23 10:10:15,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-23 10:10:15,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-23 10:10:15,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2018-10-23 10:10:15,833 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 75 [2018-10-23 10:10:15,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:15,834 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2018-10-23 10:10:15,834 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-23 10:10:15,834 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2018-10-23 10:10:15,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-23 10:10:15,835 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:15,835 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:15,835 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:15,836 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:15,836 INFO L82 PathProgramCache]: Analyzing trace with hash 981858762, now seen corresponding path program 15 times [2018-10-23 10:10:15,836 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:15,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:15,837 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:15,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:15,837 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:15,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:16,270 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 50 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:16,270 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:16,270 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:16,270 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:16,271 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:16,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:16,271 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:16,279 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:16,279 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:16,297 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:16,297 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:16,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:16,318 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 50 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:16,319 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:17,268 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 50 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:17,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:17,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 37 [2018-10-23 10:10:17,288 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:17,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-23 10:10:17,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-23 10:10:17,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=938, Unknown=0, NotChecked=0, Total=1332 [2018-10-23 10:10:17,290 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand 20 states. [2018-10-23 10:10:17,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:17,935 INFO L93 Difference]: Finished difference Result 95 states and 99 transitions. [2018-10-23 10:10:17,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-23 10:10:17,935 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 79 [2018-10-23 10:10:17,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:17,937 INFO L225 Difference]: With dead ends: 95 [2018-10-23 10:10:17,937 INFO L226 Difference]: Without dead ends: 86 [2018-10-23 10:10:17,938 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 141 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=394, Invalid=938, Unknown=0, NotChecked=0, Total=1332 [2018-10-23 10:10:17,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2018-10-23 10:10:17,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2018-10-23 10:10:17,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-10-23 10:10:17,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2018-10-23 10:10:17,944 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 79 [2018-10-23 10:10:17,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:17,944 INFO L481 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2018-10-23 10:10:17,944 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-23 10:10:17,944 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2018-10-23 10:10:17,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-23 10:10:17,946 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:17,946 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:17,946 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:17,946 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:17,946 INFO L82 PathProgramCache]: Analyzing trace with hash 1080988978, now seen corresponding path program 16 times [2018-10-23 10:10:17,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:17,947 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:17,948 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:17,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:17,948 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:17,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:19,079 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 53 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:19,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:19,080 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:19,080 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:19,080 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:19,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:19,080 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:19,088 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:19,089 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:19,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:19,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:19,149 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 53 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:19,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:20,668 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 53 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:20,690 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:20,690 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 39 [2018-10-23 10:10:20,690 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:20,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-23 10:10:20,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-23 10:10:20,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=1047, Unknown=0, NotChecked=0, Total=1482 [2018-10-23 10:10:20,691 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand 21 states. [2018-10-23 10:10:21,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:21,364 INFO L93 Difference]: Finished difference Result 99 states and 103 transitions. [2018-10-23 10:10:21,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-23 10:10:21,365 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 83 [2018-10-23 10:10:21,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:21,366 INFO L225 Difference]: With dead ends: 99 [2018-10-23 10:10:21,366 INFO L226 Difference]: Without dead ends: 90 [2018-10-23 10:10:21,367 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=435, Invalid=1047, Unknown=0, NotChecked=0, Total=1482 [2018-10-23 10:10:21,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-10-23 10:10:21,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-10-23 10:10:21,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-23 10:10:21,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2018-10-23 10:10:21,371 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 83 [2018-10-23 10:10:21,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:21,372 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2018-10-23 10:10:21,372 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-23 10:10:21,372 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2018-10-23 10:10:21,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-23 10:10:21,372 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:21,373 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:21,373 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:21,373 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:21,373 INFO L82 PathProgramCache]: Analyzing trace with hash -1605682022, now seen corresponding path program 17 times [2018-10-23 10:10:21,373 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:21,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:21,374 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:21,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:21,374 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:21,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:21,832 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 56 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:21,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:21,832 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:21,832 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:21,832 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:21,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:21,832 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:21,841 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:21,841 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:21,859 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:21,859 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:21,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:21,888 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 56 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:21,888 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:23,244 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 56 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:23,264 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:23,264 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 41 [2018-10-23 10:10:23,264 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:23,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-23 10:10:23,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-23 10:10:23,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=1162, Unknown=0, NotChecked=0, Total=1640 [2018-10-23 10:10:23,266 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand 22 states. [2018-10-23 10:10:24,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:24,037 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2018-10-23 10:10:24,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-23 10:10:24,037 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 87 [2018-10-23 10:10:24,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:24,038 INFO L225 Difference]: With dead ends: 103 [2018-10-23 10:10:24,039 INFO L226 Difference]: Without dead ends: 94 [2018-10-23 10:10:24,040 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 155 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=478, Invalid=1162, Unknown=0, NotChecked=0, Total=1640 [2018-10-23 10:10:24,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-23 10:10:24,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-23 10:10:24,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-23 10:10:24,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2018-10-23 10:10:24,044 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 87 [2018-10-23 10:10:24,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:24,044 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2018-10-23 10:10:24,044 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-23 10:10:24,044 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2018-10-23 10:10:24,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-10-23 10:10:24,045 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:24,045 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:24,045 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:24,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:24,045 INFO L82 PathProgramCache]: Analyzing trace with hash -382341118, now seen corresponding path program 18 times [2018-10-23 10:10:24,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:24,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:24,046 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:24,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:24,046 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:24,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:24,677 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 59 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:24,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:24,677 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:24,678 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:24,678 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:24,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:24,678 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:24,686 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:24,686 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:24,706 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:24,707 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:24,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:24,747 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 59 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:24,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:26,345 INFO L134 CoverageAnalysis]: Checked inductivity of 800 backedges. 59 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:26,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:26,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 43 [2018-10-23 10:10:26,366 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:26,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-23 10:10:26,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-23 10:10:26,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=1283, Unknown=0, NotChecked=0, Total=1806 [2018-10-23 10:10:26,367 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand 23 states. [2018-10-23 10:10:27,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:27,190 INFO L93 Difference]: Finished difference Result 107 states and 111 transitions. [2018-10-23 10:10:27,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-23 10:10:27,191 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 91 [2018-10-23 10:10:27,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:27,192 INFO L225 Difference]: With dead ends: 107 [2018-10-23 10:10:27,192 INFO L226 Difference]: Without dead ends: 98 [2018-10-23 10:10:27,193 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 162 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=523, Invalid=1283, Unknown=0, NotChecked=0, Total=1806 [2018-10-23 10:10:27,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2018-10-23 10:10:27,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2018-10-23 10:10:27,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-23 10:10:27,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2018-10-23 10:10:27,197 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 91 [2018-10-23 10:10:27,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:27,198 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2018-10-23 10:10:27,198 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-23 10:10:27,198 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2018-10-23 10:10:27,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-23 10:10:27,199 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:27,199 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:27,199 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:27,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:27,199 INFO L82 PathProgramCache]: Analyzing trace with hash -1924616342, now seen corresponding path program 19 times [2018-10-23 10:10:27,200 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:27,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:27,200 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:27,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:27,200 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:27,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:27,826 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 62 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:27,826 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:27,826 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:27,827 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:27,827 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:27,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:27,827 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:27,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:27,834 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:27,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:27,858 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:27,908 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 62 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:27,908 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:29,185 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 62 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:29,205 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:29,205 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 45 [2018-10-23 10:10:29,205 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:29,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-23 10:10:29,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-23 10:10:29,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=570, Invalid=1410, Unknown=0, NotChecked=0, Total=1980 [2018-10-23 10:10:29,207 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand 24 states. [2018-10-23 10:10:30,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:30,181 INFO L93 Difference]: Finished difference Result 111 states and 115 transitions. [2018-10-23 10:10:30,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-23 10:10:30,181 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 95 [2018-10-23 10:10:30,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:30,182 INFO L225 Difference]: With dead ends: 111 [2018-10-23 10:10:30,182 INFO L226 Difference]: Without dead ends: 102 [2018-10-23 10:10:30,184 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 169 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=570, Invalid=1410, Unknown=0, NotChecked=0, Total=1980 [2018-10-23 10:10:30,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-23 10:10:30,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2018-10-23 10:10:30,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-10-23 10:10:30,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-10-23 10:10:30,189 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 95 [2018-10-23 10:10:30,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:30,189 INFO L481 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-10-23 10:10:30,189 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-23 10:10:30,189 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-10-23 10:10:30,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-23 10:10:30,190 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:30,190 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:30,190 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:30,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:30,191 INFO L82 PathProgramCache]: Analyzing trace with hash 1637710546, now seen corresponding path program 20 times [2018-10-23 10:10:30,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:30,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:30,192 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:30,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:30,192 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:30,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:30,790 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 65 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:30,790 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:30,790 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:30,791 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:30,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:30,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:30,791 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:30,800 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:30,800 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:30,823 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:30,823 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:30,825 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:30,871 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 65 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:30,871 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:32,772 INFO L134 CoverageAnalysis]: Checked inductivity of 968 backedges. 65 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:32,792 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:32,792 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 47 [2018-10-23 10:10:32,792 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:32,792 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-23 10:10:32,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-23 10:10:32,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=619, Invalid=1543, Unknown=0, NotChecked=0, Total=2162 [2018-10-23 10:10:32,793 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 25 states. [2018-10-23 10:10:33,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:33,773 INFO L93 Difference]: Finished difference Result 115 states and 119 transitions. [2018-10-23 10:10:33,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-23 10:10:33,777 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 99 [2018-10-23 10:10:33,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:33,778 INFO L225 Difference]: With dead ends: 115 [2018-10-23 10:10:33,778 INFO L226 Difference]: Without dead ends: 106 [2018-10-23 10:10:33,779 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 176 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=619, Invalid=1543, Unknown=0, NotChecked=0, Total=2162 [2018-10-23 10:10:33,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-23 10:10:33,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-23 10:10:33,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-23 10:10:33,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2018-10-23 10:10:33,784 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 99 [2018-10-23 10:10:33,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:33,784 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2018-10-23 10:10:33,784 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-23 10:10:33,784 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2018-10-23 10:10:33,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-10-23 10:10:33,786 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:33,786 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:33,787 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:33,787 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:33,787 INFO L82 PathProgramCache]: Analyzing trace with hash 508449338, now seen corresponding path program 21 times [2018-10-23 10:10:33,787 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:33,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:33,788 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:33,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:33,788 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:33,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:34,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 68 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:34,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:34,292 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:34,292 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:34,292 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:34,292 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:34,292 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:34,311 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:34,311 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:34,331 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:34,331 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:34,333 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:34,378 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 68 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:34,378 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:36,530 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 68 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:36,550 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:36,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 49 [2018-10-23 10:10:36,550 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:36,550 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-23 10:10:36,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-23 10:10:36,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=670, Invalid=1682, Unknown=0, NotChecked=0, Total=2352 [2018-10-23 10:10:36,551 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand 26 states. [2018-10-23 10:10:37,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:37,612 INFO L93 Difference]: Finished difference Result 119 states and 123 transitions. [2018-10-23 10:10:37,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-23 10:10:37,612 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 103 [2018-10-23 10:10:37,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:37,614 INFO L225 Difference]: With dead ends: 119 [2018-10-23 10:10:37,614 INFO L226 Difference]: Without dead ends: 110 [2018-10-23 10:10:37,616 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 183 SyntacticMatches, 2 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=670, Invalid=1682, Unknown=0, NotChecked=0, Total=2352 [2018-10-23 10:10:37,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-10-23 10:10:37,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2018-10-23 10:10:37,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-10-23 10:10:37,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2018-10-23 10:10:37,620 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 103 [2018-10-23 10:10:37,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:37,620 INFO L481 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2018-10-23 10:10:37,620 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-23 10:10:37,620 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2018-10-23 10:10:37,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-23 10:10:37,621 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:37,621 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:37,621 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:37,622 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:37,622 INFO L82 PathProgramCache]: Analyzing trace with hash -562743902, now seen corresponding path program 22 times [2018-10-23 10:10:37,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:37,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:37,623 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:37,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:37,623 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:37,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:39,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 71 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:39,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:39,083 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:39,083 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:39,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:39,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:39,084 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:39,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:39,095 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:39,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:39,129 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:39,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 71 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:39,174 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:40,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1152 backedges. 71 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:40,986 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:40,986 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 51 [2018-10-23 10:10:40,986 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:40,986 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-23 10:10:40,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-23 10:10:40,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=723, Invalid=1827, Unknown=0, NotChecked=0, Total=2550 [2018-10-23 10:10:40,988 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand 27 states. [2018-10-23 10:10:42,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:42,180 INFO L93 Difference]: Finished difference Result 123 states and 127 transitions. [2018-10-23 10:10:42,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-23 10:10:42,180 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 107 [2018-10-23 10:10:42,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:42,182 INFO L225 Difference]: With dead ends: 123 [2018-10-23 10:10:42,182 INFO L226 Difference]: Without dead ends: 114 [2018-10-23 10:10:42,184 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 190 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=723, Invalid=1827, Unknown=0, NotChecked=0, Total=2550 [2018-10-23 10:10:42,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-10-23 10:10:42,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2018-10-23 10:10:42,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2018-10-23 10:10:42,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2018-10-23 10:10:42,188 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 107 [2018-10-23 10:10:42,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:42,189 INFO L481 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2018-10-23 10:10:42,189 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-23 10:10:42,189 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2018-10-23 10:10:42,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-10-23 10:10:42,190 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:42,190 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:42,190 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:42,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:42,190 INFO L82 PathProgramCache]: Analyzing trace with hash -1607719670, now seen corresponding path program 23 times [2018-10-23 10:10:42,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:42,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:42,191 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:42,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:42,192 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:42,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:42,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1250 backedges. 74 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:42,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:42,865 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:42,865 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:42,865 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:42,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:42,865 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:42,889 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:42,889 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:42,912 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:42,912 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:42,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:42,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1250 backedges. 74 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:42,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:44,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1250 backedges. 74 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:44,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:44,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 53 [2018-10-23 10:10:44,847 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:44,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-23 10:10:44,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-23 10:10:44,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=778, Invalid=1978, Unknown=0, NotChecked=0, Total=2756 [2018-10-23 10:10:44,849 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand 28 states. [2018-10-23 10:10:46,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:46,238 INFO L93 Difference]: Finished difference Result 127 states and 131 transitions. [2018-10-23 10:10:46,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-23 10:10:46,239 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 111 [2018-10-23 10:10:46,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:46,240 INFO L225 Difference]: With dead ends: 127 [2018-10-23 10:10:46,240 INFO L226 Difference]: Without dead ends: 118 [2018-10-23 10:10:46,242 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 197 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=778, Invalid=1978, Unknown=0, NotChecked=0, Total=2756 [2018-10-23 10:10:46,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-23 10:10:46,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-23 10:10:46,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-23 10:10:46,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2018-10-23 10:10:46,247 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 111 [2018-10-23 10:10:46,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:46,247 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2018-10-23 10:10:46,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-23 10:10:46,248 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2018-10-23 10:10:46,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-23 10:10:46,248 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:46,249 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:46,249 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:46,249 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:46,249 INFO L82 PathProgramCache]: Analyzing trace with hash -997384078, now seen corresponding path program 24 times [2018-10-23 10:10:46,249 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:46,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:46,250 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:46,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:46,250 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:46,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:47,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 77 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:47,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:47,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:47,331 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:47,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:47,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:47,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:47,338 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:10:47,338 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:10:47,363 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:10:47,363 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:47,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:47,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 77 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:47,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:49,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1352 backedges. 77 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:49,366 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:49,366 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 55 [2018-10-23 10:10:49,366 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:49,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-23 10:10:49,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-23 10:10:49,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=835, Invalid=2135, Unknown=0, NotChecked=0, Total=2970 [2018-10-23 10:10:49,368 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand 29 states. [2018-10-23 10:10:50,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:50,900 INFO L93 Difference]: Finished difference Result 131 states and 135 transitions. [2018-10-23 10:10:50,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-23 10:10:50,900 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 115 [2018-10-23 10:10:50,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:50,901 INFO L225 Difference]: With dead ends: 131 [2018-10-23 10:10:50,901 INFO L226 Difference]: Without dead ends: 122 [2018-10-23 10:10:50,902 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 204 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=835, Invalid=2135, Unknown=0, NotChecked=0, Total=2970 [2018-10-23 10:10:50,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-10-23 10:10:50,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2018-10-23 10:10:50,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-10-23 10:10:50,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2018-10-23 10:10:50,908 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 115 [2018-10-23 10:10:50,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:50,908 INFO L481 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2018-10-23 10:10:50,908 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-23 10:10:50,908 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2018-10-23 10:10:50,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-23 10:10:50,909 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:50,909 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:50,909 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:50,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:50,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1884149798, now seen corresponding path program 25 times [2018-10-23 10:10:50,910 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:50,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:50,911 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:10:50,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:50,911 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:50,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:51,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 80 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:51,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:51,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:51,807 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:51,807 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:51,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:51,807 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:51,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:51,815 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:10:51,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:51,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:51,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 80 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:51,879 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:53,929 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 80 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:53,949 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:53,949 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 57 [2018-10-23 10:10:53,949 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:53,950 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-23 10:10:53,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-23 10:10:53,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=894, Invalid=2298, Unknown=0, NotChecked=0, Total=3192 [2018-10-23 10:10:53,951 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand 30 states. [2018-10-23 10:10:55,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:10:55,455 INFO L93 Difference]: Finished difference Result 135 states and 139 transitions. [2018-10-23 10:10:55,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-23 10:10:55,456 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 119 [2018-10-23 10:10:55,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:10:55,457 INFO L225 Difference]: With dead ends: 135 [2018-10-23 10:10:55,458 INFO L226 Difference]: Without dead ends: 126 [2018-10-23 10:10:55,459 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 211 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=894, Invalid=2298, Unknown=0, NotChecked=0, Total=3192 [2018-10-23 10:10:55,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-10-23 10:10:55,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2018-10-23 10:10:55,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-10-23 10:10:55,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2018-10-23 10:10:55,464 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 119 [2018-10-23 10:10:55,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:10:55,465 INFO L481 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2018-10-23 10:10:55,465 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-23 10:10:55,465 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2018-10-23 10:10:55,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-23 10:10:55,466 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:10:55,466 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:10:55,466 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:10:55,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:10:55,466 INFO L82 PathProgramCache]: Analyzing trace with hash -1464517822, now seen corresponding path program 26 times [2018-10-23 10:10:55,466 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:10:55,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:55,467 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:10:55,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:10:55,467 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:10:55,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:10:56,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1568 backedges. 83 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:56,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:56,370 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:10:56,370 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:10:56,371 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:10:56,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:10:56,371 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:10:56,378 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:10:56,378 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:10:56,404 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:10:56,404 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:10:56,407 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:10:56,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1568 backedges. 83 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:56,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:10:58,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1568 backedges. 83 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:10:58,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:10:58,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 59 [2018-10-23 10:10:58,818 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:10:58,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-23 10:10:58,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-23 10:10:58,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=955, Invalid=2467, Unknown=0, NotChecked=0, Total=3422 [2018-10-23 10:10:58,820 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand 31 states. [2018-10-23 10:11:00,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:00,324 INFO L93 Difference]: Finished difference Result 139 states and 143 transitions. [2018-10-23 10:11:00,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-23 10:11:00,325 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 123 [2018-10-23 10:11:00,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:00,326 INFO L225 Difference]: With dead ends: 139 [2018-10-23 10:11:00,326 INFO L226 Difference]: Without dead ends: 130 [2018-10-23 10:11:00,327 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 218 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=955, Invalid=2467, Unknown=0, NotChecked=0, Total=3422 [2018-10-23 10:11:00,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-23 10:11:00,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-23 10:11:00,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-23 10:11:00,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2018-10-23 10:11:00,333 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 123 [2018-10-23 10:11:00,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:00,333 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2018-10-23 10:11:00,333 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-23 10:11:00,333 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2018-10-23 10:11:00,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-23 10:11:00,334 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:00,334 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:00,335 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:00,335 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:00,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1716495702, now seen corresponding path program 27 times [2018-10-23 10:11:00,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:00,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:00,336 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:00,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:00,336 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:00,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:01,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1682 backedges. 86 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:01,494 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:01,494 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:01,495 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:01,495 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:01,495 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:01,495 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:01,502 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:11:01,502 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:11:01,531 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:11:01,532 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:01,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 1682 backedges. 86 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:01,587 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:04,350 INFO L134 CoverageAnalysis]: Checked inductivity of 1682 backedges. 86 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:04,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:04,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 61 [2018-10-23 10:11:04,372 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:04,372 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-23 10:11:04,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-23 10:11:04,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1018, Invalid=2642, Unknown=0, NotChecked=0, Total=3660 [2018-10-23 10:11:04,373 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand 32 states. [2018-10-23 10:11:06,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:06,161 INFO L93 Difference]: Finished difference Result 143 states and 147 transitions. [2018-10-23 10:11:06,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-23 10:11:06,161 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 127 [2018-10-23 10:11:06,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:06,162 INFO L225 Difference]: With dead ends: 143 [2018-10-23 10:11:06,162 INFO L226 Difference]: Without dead ends: 134 [2018-10-23 10:11:06,163 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 225 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=1018, Invalid=2642, Unknown=0, NotChecked=0, Total=3660 [2018-10-23 10:11:06,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2018-10-23 10:11:06,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2018-10-23 10:11:06,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-23 10:11:06,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2018-10-23 10:11:06,169 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 127 [2018-10-23 10:11:06,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:06,170 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2018-10-23 10:11:06,170 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-23 10:11:06,170 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2018-10-23 10:11:06,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-23 10:11:06,171 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:06,171 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:06,171 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:06,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:06,171 INFO L82 PathProgramCache]: Analyzing trace with hash 1337820690, now seen corresponding path program 28 times [2018-10-23 10:11:06,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:06,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:06,172 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:06,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:06,172 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:06,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:06,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1800 backedges. 89 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:06,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:06,911 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:06,911 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:06,912 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:06,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:06,912 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:06,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:06,939 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:11:06,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:06,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:07,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1800 backedges. 89 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:07,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:09,831 INFO L134 CoverageAnalysis]: Checked inductivity of 1800 backedges. 89 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:09,852 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:09,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 63 [2018-10-23 10:11:09,852 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:09,853 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-23 10:11:09,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-23 10:11:09,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=2823, Unknown=0, NotChecked=0, Total=3906 [2018-10-23 10:11:09,854 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand 33 states. [2018-10-23 10:11:11,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:11,778 INFO L93 Difference]: Finished difference Result 147 states and 151 transitions. [2018-10-23 10:11:11,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-23 10:11:11,779 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 131 [2018-10-23 10:11:11,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:11,780 INFO L225 Difference]: With dead ends: 147 [2018-10-23 10:11:11,780 INFO L226 Difference]: Without dead ends: 138 [2018-10-23 10:11:11,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 232 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1083, Invalid=2823, Unknown=0, NotChecked=0, Total=3906 [2018-10-23 10:11:11,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-10-23 10:11:11,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2018-10-23 10:11:11,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-23 10:11:11,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 139 transitions. [2018-10-23 10:11:11,787 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 139 transitions. Word has length 131 [2018-10-23 10:11:11,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:11,788 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 139 transitions. [2018-10-23 10:11:11,788 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-23 10:11:11,788 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 139 transitions. [2018-10-23 10:11:11,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-23 10:11:11,789 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:11,789 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:11,789 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:11,789 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:11,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1695105670, now seen corresponding path program 29 times [2018-10-23 10:11:11,789 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:11,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:11,790 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:11,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:11,790 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:11,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:12,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 92 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:12,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:12,813 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:12,813 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:12,813 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:12,813 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:12,814 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:12,822 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:11:12,822 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:11:12,852 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:11:12,852 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:12,855 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:12,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 92 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:12,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:15,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 92 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:15,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:15,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 65 [2018-10-23 10:11:15,680 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:15,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-23 10:11:15,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-23 10:11:15,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1150, Invalid=3010, Unknown=0, NotChecked=0, Total=4160 [2018-10-23 10:11:15,682 INFO L87 Difference]: Start difference. First operand 137 states and 139 transitions. Second operand 34 states. [2018-10-23 10:11:17,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:17,677 INFO L93 Difference]: Finished difference Result 151 states and 155 transitions. [2018-10-23 10:11:17,677 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-23 10:11:17,678 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 135 [2018-10-23 10:11:17,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:17,679 INFO L225 Difference]: With dead ends: 151 [2018-10-23 10:11:17,680 INFO L226 Difference]: Without dead ends: 142 [2018-10-23 10:11:17,680 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 239 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1150, Invalid=3010, Unknown=0, NotChecked=0, Total=4160 [2018-10-23 10:11:17,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-23 10:11:17,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-23 10:11:17,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-23 10:11:17,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2018-10-23 10:11:17,685 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 135 [2018-10-23 10:11:17,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:17,685 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2018-10-23 10:11:17,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-23 10:11:17,686 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2018-10-23 10:11:17,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-10-23 10:11:17,686 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:17,687 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:17,687 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:17,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:17,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1367998238, now seen corresponding path program 30 times [2018-10-23 10:11:17,687 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:17,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:17,688 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:17,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:17,688 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:17,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:18,601 INFO L134 CoverageAnalysis]: Checked inductivity of 2048 backedges. 95 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:18,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:18,601 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:18,601 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:18,601 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:18,601 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:18,601 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:18,608 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:11:18,608 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:11:18,644 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:11:18,644 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:18,647 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:18,714 INFO L134 CoverageAnalysis]: Checked inductivity of 2048 backedges. 95 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:18,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:23,927 INFO L134 CoverageAnalysis]: Checked inductivity of 2048 backedges. 95 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:23,947 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:23,947 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 67 [2018-10-23 10:11:23,947 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:23,948 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-23 10:11:23,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-23 10:11:23,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1219, Invalid=3202, Unknown=1, NotChecked=0, Total=4422 [2018-10-23 10:11:23,949 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand 35 states. [2018-10-23 10:11:27,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:27,237 INFO L93 Difference]: Finished difference Result 155 states and 159 transitions. [2018-10-23 10:11:27,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-23 10:11:27,237 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 139 [2018-10-23 10:11:27,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:27,239 INFO L225 Difference]: With dead ends: 155 [2018-10-23 10:11:27,239 INFO L226 Difference]: Without dead ends: 146 [2018-10-23 10:11:27,240 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 246 SyntacticMatches, 2 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=1219, Invalid=3202, Unknown=1, NotChecked=0, Total=4422 [2018-10-23 10:11:27,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-10-23 10:11:27,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2018-10-23 10:11:27,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2018-10-23 10:11:27,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2018-10-23 10:11:27,247 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 139 [2018-10-23 10:11:27,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:27,247 INFO L481 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2018-10-23 10:11:27,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-23 10:11:27,247 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2018-10-23 10:11:27,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-23 10:11:27,248 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:27,248 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:27,248 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:27,249 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:27,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1605021622, now seen corresponding path program 31 times [2018-10-23 10:11:27,249 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:27,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:27,249 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:27,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:27,250 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:27,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:28,155 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 98 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:28,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:28,155 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:28,155 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:28,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:28,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:28,156 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:28,162 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:28,162 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:11:28,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:28,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:28,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 98 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:28,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:31,724 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 98 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:31,744 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:31,744 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 69 [2018-10-23 10:11:31,744 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:31,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-23 10:11:31,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-23 10:11:31,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1290, Invalid=3402, Unknown=0, NotChecked=0, Total=4692 [2018-10-23 10:11:31,746 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand 36 states. [2018-10-23 10:11:33,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:33,864 INFO L93 Difference]: Finished difference Result 159 states and 163 transitions. [2018-10-23 10:11:33,865 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-23 10:11:33,865 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 143 [2018-10-23 10:11:33,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:33,866 INFO L225 Difference]: With dead ends: 159 [2018-10-23 10:11:33,866 INFO L226 Difference]: Without dead ends: 150 [2018-10-23 10:11:33,868 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 253 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1290, Invalid=3402, Unknown=0, NotChecked=0, Total=4692 [2018-10-23 10:11:33,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-10-23 10:11:33,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2018-10-23 10:11:33,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-10-23 10:11:33,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2018-10-23 10:11:33,874 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 143 [2018-10-23 10:11:33,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:33,875 INFO L481 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2018-10-23 10:11:33,875 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-23 10:11:33,875 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2018-10-23 10:11:33,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-23 10:11:33,876 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:33,876 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:33,876 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:33,876 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:33,877 INFO L82 PathProgramCache]: Analyzing trace with hash -374428750, now seen corresponding path program 32 times [2018-10-23 10:11:33,877 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:33,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:33,877 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:33,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:33,878 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:33,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:34,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2312 backedges. 101 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:34,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:34,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:34,760 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:34,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:34,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:34,761 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:34,781 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:11:34,781 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:11:34,828 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:11:34,828 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:34,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:34,937 INFO L134 CoverageAnalysis]: Checked inductivity of 2312 backedges. 101 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:34,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:38,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2312 backedges. 101 proven. 2211 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:38,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:38,656 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 71 [2018-10-23 10:11:38,656 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:38,657 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-23 10:11:38,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-23 10:11:38,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1363, Invalid=3607, Unknown=0, NotChecked=0, Total=4970 [2018-10-23 10:11:38,658 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand 37 states. [2018-10-23 10:11:40,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:40,906 INFO L93 Difference]: Finished difference Result 163 states and 167 transitions. [2018-10-23 10:11:40,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-23 10:11:40,907 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 147 [2018-10-23 10:11:40,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:40,908 INFO L225 Difference]: With dead ends: 163 [2018-10-23 10:11:40,908 INFO L226 Difference]: Without dead ends: 154 [2018-10-23 10:11:40,909 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 260 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1363, Invalid=3607, Unknown=0, NotChecked=0, Total=4970 [2018-10-23 10:11:40,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-23 10:11:40,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-23 10:11:40,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-23 10:11:40,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2018-10-23 10:11:40,914 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 147 [2018-10-23 10:11:40,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:40,915 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2018-10-23 10:11:40,915 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-23 10:11:40,915 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2018-10-23 10:11:40,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-10-23 10:11:40,916 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:40,916 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:40,916 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:40,916 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:40,917 INFO L82 PathProgramCache]: Analyzing trace with hash -425979110, now seen corresponding path program 33 times [2018-10-23 10:11:40,917 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:40,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:40,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:40,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:40,917 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:40,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:41,759 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 104 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:41,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:41,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:41,760 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:41,760 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:41,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:41,760 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:41,767 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:11:41,767 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:11:41,798 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:11:41,799 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:41,801 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:41,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 104 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:41,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:45,702 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 104 proven. 2346 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:45,722 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:45,722 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 73 [2018-10-23 10:11:45,723 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:45,723 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-23 10:11:45,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-23 10:11:45,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1438, Invalid=3818, Unknown=0, NotChecked=0, Total=5256 [2018-10-23 10:11:45,724 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand 38 states. [2018-10-23 10:11:48,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:48,252 INFO L93 Difference]: Finished difference Result 167 states and 171 transitions. [2018-10-23 10:11:48,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-23 10:11:48,253 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 151 [2018-10-23 10:11:48,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:48,255 INFO L225 Difference]: With dead ends: 167 [2018-10-23 10:11:48,255 INFO L226 Difference]: Without dead ends: 158 [2018-10-23 10:11:48,255 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 267 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1438, Invalid=3818, Unknown=0, NotChecked=0, Total=5256 [2018-10-23 10:11:48,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2018-10-23 10:11:48,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2018-10-23 10:11:48,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-23 10:11:48,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2018-10-23 10:11:48,261 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 151 [2018-10-23 10:11:48,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:48,262 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2018-10-23 10:11:48,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-23 10:11:48,262 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2018-10-23 10:11:48,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-23 10:11:48,263 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:48,263 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:48,263 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:48,264 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:48,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1446479490, now seen corresponding path program 34 times [2018-10-23 10:11:48,264 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:48,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:48,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:11:48,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:48,265 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:48,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:50,414 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 107 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:50,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:50,415 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:50,415 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:50,415 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:50,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:50,416 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:50,430 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:50,431 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:11:50,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:50,473 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:50,574 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 107 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:50,574 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:11:54,438 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 107 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:54,458 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:11:54,458 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 75 [2018-10-23 10:11:54,458 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:11:54,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-23 10:11:54,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-23 10:11:54,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1515, Invalid=4035, Unknown=0, NotChecked=0, Total=5550 [2018-10-23 10:11:54,459 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand 39 states. [2018-10-23 10:11:56,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:11:56,944 INFO L93 Difference]: Finished difference Result 171 states and 175 transitions. [2018-10-23 10:11:56,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-23 10:11:56,945 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 155 [2018-10-23 10:11:56,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:11:56,947 INFO L225 Difference]: With dead ends: 171 [2018-10-23 10:11:56,947 INFO L226 Difference]: Without dead ends: 162 [2018-10-23 10:11:56,948 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 274 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1515, Invalid=4035, Unknown=0, NotChecked=0, Total=5550 [2018-10-23 10:11:56,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-23 10:11:56,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2018-10-23 10:11:56,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2018-10-23 10:11:56,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2018-10-23 10:11:56,953 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 155 [2018-10-23 10:11:56,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:11:56,954 INFO L481 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2018-10-23 10:11:56,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-23 10:11:56,954 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2018-10-23 10:11:56,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-23 10:11:56,955 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:11:56,955 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:11:56,955 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:11:56,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:11:56,956 INFO L82 PathProgramCache]: Analyzing trace with hash -627374614, now seen corresponding path program 35 times [2018-10-23 10:11:56,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:11:56,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:56,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:11:56,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:11:56,957 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:11:56,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:11:58,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2738 backedges. 110 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:58,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:58,112 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:11:58,113 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:11:58,113 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:11:58,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:11:58,113 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:11:58,126 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:11:58,126 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:11:58,177 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:11:58,177 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:11:58,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:11:58,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2738 backedges. 110 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:11:58,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:02,447 INFO L134 CoverageAnalysis]: Checked inductivity of 2738 backedges. 110 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:02,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:02,469 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 77 [2018-10-23 10:12:02,469 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:02,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-23 10:12:02,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-23 10:12:02,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=4258, Unknown=0, NotChecked=0, Total=5852 [2018-10-23 10:12:02,470 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand 40 states. [2018-10-23 10:12:05,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:05,106 INFO L93 Difference]: Finished difference Result 175 states and 179 transitions. [2018-10-23 10:12:05,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-23 10:12:05,106 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 159 [2018-10-23 10:12:05,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:05,108 INFO L225 Difference]: With dead ends: 175 [2018-10-23 10:12:05,109 INFO L226 Difference]: Without dead ends: 166 [2018-10-23 10:12:05,109 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 281 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=1594, Invalid=4258, Unknown=0, NotChecked=0, Total=5852 [2018-10-23 10:12:05,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-23 10:12:05,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-23 10:12:05,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-23 10:12:05,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2018-10-23 10:12:05,116 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 159 [2018-10-23 10:12:05,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:05,116 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2018-10-23 10:12:05,117 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-23 10:12:05,117 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2018-10-23 10:12:05,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-10-23 10:12:05,118 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:05,118 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:05,118 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:05,118 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:05,118 INFO L82 PathProgramCache]: Analyzing trace with hash 2027983186, now seen corresponding path program 36 times [2018-10-23 10:12:05,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:05,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:05,119 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:12:05,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:05,119 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:05,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:06,412 INFO L134 CoverageAnalysis]: Checked inductivity of 2888 backedges. 113 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:06,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:06,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:06,412 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:06,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:06,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:06,413 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:06,424 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:12:06,424 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:12:06,456 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:12:06,456 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:12:06,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:06,569 INFO L134 CoverageAnalysis]: Checked inductivity of 2888 backedges. 113 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:06,569 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:11,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2888 backedges. 113 proven. 2775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:11,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:11,668 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 79 [2018-10-23 10:12:11,669 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:11,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-23 10:12:11,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-23 10:12:11,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1675, Invalid=4487, Unknown=0, NotChecked=0, Total=6162 [2018-10-23 10:12:11,670 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand 41 states. [2018-10-23 10:12:14,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:14,490 INFO L93 Difference]: Finished difference Result 179 states and 183 transitions. [2018-10-23 10:12:14,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-23 10:12:14,490 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 163 [2018-10-23 10:12:14,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:14,492 INFO L225 Difference]: With dead ends: 179 [2018-10-23 10:12:14,492 INFO L226 Difference]: Without dead ends: 170 [2018-10-23 10:12:14,493 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 288 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=1675, Invalid=4487, Unknown=0, NotChecked=0, Total=6162 [2018-10-23 10:12:14,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2018-10-23 10:12:14,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2018-10-23 10:12:14,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-23 10:12:14,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2018-10-23 10:12:14,500 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 163 [2018-10-23 10:12:14,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:14,500 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2018-10-23 10:12:14,500 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-23 10:12:14,500 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2018-10-23 10:12:14,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-23 10:12:14,501 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:14,502 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:14,502 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:14,502 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:14,502 INFO L82 PathProgramCache]: Analyzing trace with hash 421669050, now seen corresponding path program 37 times [2018-10-23 10:12:14,502 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:14,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:14,503 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:12:14,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:14,503 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:14,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:15,476 INFO L134 CoverageAnalysis]: Checked inductivity of 3042 backedges. 116 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:15,476 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:15,477 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:15,477 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:15,477 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:15,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:15,477 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:15,485 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:12:15,485 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:12:15,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:15,524 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:15,587 INFO L134 CoverageAnalysis]: Checked inductivity of 3042 backedges. 116 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:15,587 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:20,412 INFO L134 CoverageAnalysis]: Checked inductivity of 3042 backedges. 116 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:20,431 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:20,432 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 81 [2018-10-23 10:12:20,432 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:20,432 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-23 10:12:20,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-23 10:12:20,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1758, Invalid=4722, Unknown=0, NotChecked=0, Total=6480 [2018-10-23 10:12:20,433 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand 42 states. [2018-10-23 10:12:23,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:23,486 INFO L93 Difference]: Finished difference Result 183 states and 187 transitions. [2018-10-23 10:12:23,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-23 10:12:23,487 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 167 [2018-10-23 10:12:23,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:23,488 INFO L225 Difference]: With dead ends: 183 [2018-10-23 10:12:23,488 INFO L226 Difference]: Without dead ends: 174 [2018-10-23 10:12:23,489 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 295 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1758, Invalid=4722, Unknown=0, NotChecked=0, Total=6480 [2018-10-23 10:12:23,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-10-23 10:12:23,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2018-10-23 10:12:23,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2018-10-23 10:12:23,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2018-10-23 10:12:23,494 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 167 [2018-10-23 10:12:23,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:23,495 INFO L481 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2018-10-23 10:12:23,495 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-23 10:12:23,495 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2018-10-23 10:12:23,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-10-23 10:12:23,496 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:23,496 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:23,496 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:23,496 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:23,496 INFO L82 PathProgramCache]: Analyzing trace with hash 108645410, now seen corresponding path program 38 times [2018-10-23 10:12:23,496 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:23,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:23,497 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:12:23,497 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:23,497 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:23,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:24,698 INFO L134 CoverageAnalysis]: Checked inductivity of 3200 backedges. 119 proven. 3081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:24,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:24,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:24,699 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:24,699 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:24,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:24,699 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:24,706 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:12:24,707 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:12:24,742 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:12:24,743 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:12:24,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:24,834 INFO L134 CoverageAnalysis]: Checked inductivity of 3200 backedges. 119 proven. 3081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:24,834 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:30,380 INFO L134 CoverageAnalysis]: Checked inductivity of 3200 backedges. 119 proven. 3081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:30,400 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:30,401 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 83 [2018-10-23 10:12:30,401 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:30,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-23 10:12:30,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-23 10:12:30,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1843, Invalid=4963, Unknown=0, NotChecked=0, Total=6806 [2018-10-23 10:12:30,402 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand 43 states. [2018-10-23 10:12:33,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:33,502 INFO L93 Difference]: Finished difference Result 187 states and 191 transitions. [2018-10-23 10:12:33,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-23 10:12:33,502 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 171 [2018-10-23 10:12:33,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:33,504 INFO L225 Difference]: With dead ends: 187 [2018-10-23 10:12:33,504 INFO L226 Difference]: Without dead ends: 178 [2018-10-23 10:12:33,505 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 302 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=1843, Invalid=4963, Unknown=0, NotChecked=0, Total=6806 [2018-10-23 10:12:33,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-23 10:12:33,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-23 10:12:33,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-23 10:12:33,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 179 transitions. [2018-10-23 10:12:33,509 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 179 transitions. Word has length 171 [2018-10-23 10:12:33,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:33,509 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 179 transitions. [2018-10-23 10:12:33,509 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-23 10:12:33,510 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 179 transitions. [2018-10-23 10:12:33,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-10-23 10:12:33,510 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:33,510 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:33,510 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:33,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:33,511 INFO L82 PathProgramCache]: Analyzing trace with hash 1862368138, now seen corresponding path program 39 times [2018-10-23 10:12:33,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:33,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:33,511 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:12:33,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:33,512 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:33,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:34,799 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 122 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:34,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:34,799 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:34,799 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:34,799 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:34,799 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:34,799 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:34,806 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:12:34,807 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:12:34,844 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:12:34,844 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:12:34,847 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:34,914 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 122 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:34,915 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:39,748 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 122 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:39,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:39,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 85 [2018-10-23 10:12:39,768 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:39,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-23 10:12:39,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-23 10:12:39,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1930, Invalid=5210, Unknown=0, NotChecked=0, Total=7140 [2018-10-23 10:12:39,770 INFO L87 Difference]: Start difference. First operand 177 states and 179 transitions. Second operand 44 states. [2018-10-23 10:12:42,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:42,949 INFO L93 Difference]: Finished difference Result 191 states and 195 transitions. [2018-10-23 10:12:42,950 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-23 10:12:42,950 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 175 [2018-10-23 10:12:42,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:42,952 INFO L225 Difference]: With dead ends: 191 [2018-10-23 10:12:42,952 INFO L226 Difference]: Without dead ends: 182 [2018-10-23 10:12:42,953 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 309 SyntacticMatches, 2 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1930, Invalid=5210, Unknown=0, NotChecked=0, Total=7140 [2018-10-23 10:12:42,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-23 10:12:42,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2018-10-23 10:12:42,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-10-23 10:12:42,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2018-10-23 10:12:42,957 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 175 [2018-10-23 10:12:42,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:42,958 INFO L481 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2018-10-23 10:12:42,958 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-23 10:12:42,958 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2018-10-23 10:12:42,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-23 10:12:42,959 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:42,959 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:42,960 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:42,960 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:42,960 INFO L82 PathProgramCache]: Analyzing trace with hash -472697102, now seen corresponding path program 40 times [2018-10-23 10:12:42,960 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:42,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:42,961 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:12:42,961 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:42,961 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:42,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:44,097 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 125 proven. 3403 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:44,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:44,098 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:44,098 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:44,098 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:44,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:44,098 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:44,107 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:12:44,107 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:12:44,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:44,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:44,216 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 125 proven. 3403 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:44,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:12:49,465 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 125 proven. 3403 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:49,484 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:12:49,485 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 87 [2018-10-23 10:12:49,485 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:12:49,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-23 10:12:49,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-23 10:12:49,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2019, Invalid=5463, Unknown=0, NotChecked=0, Total=7482 [2018-10-23 10:12:49,486 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand 45 states. [2018-10-23 10:12:52,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:12:52,775 INFO L93 Difference]: Finished difference Result 195 states and 199 transitions. [2018-10-23 10:12:52,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-23 10:12:52,775 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 179 [2018-10-23 10:12:52,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:12:52,777 INFO L225 Difference]: With dead ends: 195 [2018-10-23 10:12:52,777 INFO L226 Difference]: Without dead ends: 186 [2018-10-23 10:12:52,778 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 316 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=2019, Invalid=5463, Unknown=0, NotChecked=0, Total=7482 [2018-10-23 10:12:52,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-10-23 10:12:52,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 185. [2018-10-23 10:12:52,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2018-10-23 10:12:52,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2018-10-23 10:12:52,782 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 179 [2018-10-23 10:12:52,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:12:52,783 INFO L481 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2018-10-23 10:12:52,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-23 10:12:52,783 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2018-10-23 10:12:52,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-10-23 10:12:52,783 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:12:52,783 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:12:52,784 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:12:52,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:12:52,784 INFO L82 PathProgramCache]: Analyzing trace with hash -653722022, now seen corresponding path program 41 times [2018-10-23 10:12:52,784 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:12:52,784 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:52,784 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:12:52,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:12:52,785 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:12:52,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:12:55,503 INFO L134 CoverageAnalysis]: Checked inductivity of 3698 backedges. 128 proven. 3570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:55,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:55,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:12:55,504 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:12:55,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:12:55,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:12:55,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:12:55,513 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:12:55,514 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:12:55,553 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:12:55,554 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:12:55,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:12:55,655 INFO L134 CoverageAnalysis]: Checked inductivity of 3698 backedges. 128 proven. 3570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:12:55,655 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:00,818 INFO L134 CoverageAnalysis]: Checked inductivity of 3698 backedges. 128 proven. 3570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:00,839 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:00,840 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 89 [2018-10-23 10:13:00,840 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:00,840 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-23 10:13:00,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-23 10:13:00,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2110, Invalid=5722, Unknown=0, NotChecked=0, Total=7832 [2018-10-23 10:13:00,841 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand 46 states. [2018-10-23 10:13:04,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:04,359 INFO L93 Difference]: Finished difference Result 199 states and 203 transitions. [2018-10-23 10:13:04,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-23 10:13:04,360 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 183 [2018-10-23 10:13:04,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:04,361 INFO L225 Difference]: With dead ends: 199 [2018-10-23 10:13:04,361 INFO L226 Difference]: Without dead ends: 190 [2018-10-23 10:13:04,361 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 323 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=2110, Invalid=5722, Unknown=0, NotChecked=0, Total=7832 [2018-10-23 10:13:04,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-23 10:13:04,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-23 10:13:04,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-23 10:13:04,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2018-10-23 10:13:04,366 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 183 [2018-10-23 10:13:04,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:04,366 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2018-10-23 10:13:04,366 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-23 10:13:04,366 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2018-10-23 10:13:04,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-10-23 10:13:04,367 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:04,367 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:04,367 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:04,368 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:04,368 INFO L82 PathProgramCache]: Analyzing trace with hash 633131458, now seen corresponding path program 42 times [2018-10-23 10:13:04,368 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:04,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:04,368 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:13:04,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:04,369 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:04,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:05,573 INFO L134 CoverageAnalysis]: Checked inductivity of 3872 backedges. 131 proven. 3741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:05,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:05,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:05,574 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:05,574 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:05,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:05,574 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:05,582 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:13:05,583 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:13:05,622 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:13:05,622 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:13:05,625 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:05,690 INFO L134 CoverageAnalysis]: Checked inductivity of 3872 backedges. 131 proven. 3741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:05,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:11,221 INFO L134 CoverageAnalysis]: Checked inductivity of 3872 backedges. 131 proven. 3741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:11,241 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:11,242 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 91 [2018-10-23 10:13:11,242 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:11,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-23 10:13:11,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-23 10:13:11,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2203, Invalid=5987, Unknown=0, NotChecked=0, Total=8190 [2018-10-23 10:13:11,243 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand 47 states. [2018-10-23 10:13:14,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:14,830 INFO L93 Difference]: Finished difference Result 203 states and 207 transitions. [2018-10-23 10:13:14,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-23 10:13:14,830 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 187 [2018-10-23 10:13:14,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:14,832 INFO L225 Difference]: With dead ends: 203 [2018-10-23 10:13:14,832 INFO L226 Difference]: Without dead ends: 194 [2018-10-23 10:13:14,833 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 330 SyntacticMatches, 2 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=2203, Invalid=5987, Unknown=0, NotChecked=0, Total=8190 [2018-10-23 10:13:14,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-10-23 10:13:14,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2018-10-23 10:13:14,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2018-10-23 10:13:14,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2018-10-23 10:13:14,838 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 187 [2018-10-23 10:13:14,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:14,838 INFO L481 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2018-10-23 10:13:14,838 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-23 10:13:14,838 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2018-10-23 10:13:14,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-23 10:13:14,839 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:14,839 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:14,839 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:14,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:14,840 INFO L82 PathProgramCache]: Analyzing trace with hash -2079805142, now seen corresponding path program 43 times [2018-10-23 10:13:14,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:14,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:14,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:13:14,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:14,841 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:14,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:16,551 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 134 proven. 3916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:16,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:16,552 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:16,552 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:16,552 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:16,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:16,552 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:16,560 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:13:16,560 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:13:16,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:16,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:16,752 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 134 proven. 3916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:16,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:22,705 INFO L134 CoverageAnalysis]: Checked inductivity of 4050 backedges. 134 proven. 3916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:22,724 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:22,724 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 93 [2018-10-23 10:13:22,724 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:22,725 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-23 10:13:22,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-23 10:13:22,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2298, Invalid=6258, Unknown=0, NotChecked=0, Total=8556 [2018-10-23 10:13:22,726 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand 48 states. [2018-10-23 10:13:26,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:26,572 INFO L93 Difference]: Finished difference Result 207 states and 211 transitions. [2018-10-23 10:13:26,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-23 10:13:26,573 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 191 [2018-10-23 10:13:26,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:26,574 INFO L225 Difference]: With dead ends: 207 [2018-10-23 10:13:26,574 INFO L226 Difference]: Without dead ends: 198 [2018-10-23 10:13:26,575 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 337 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=2298, Invalid=6258, Unknown=0, NotChecked=0, Total=8556 [2018-10-23 10:13:26,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2018-10-23 10:13:26,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2018-10-23 10:13:26,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-10-23 10:13:26,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 199 transitions. [2018-10-23 10:13:26,580 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 199 transitions. Word has length 191 [2018-10-23 10:13:26,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:26,580 INFO L481 AbstractCegarLoop]: Abstraction has 197 states and 199 transitions. [2018-10-23 10:13:26,580 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-23 10:13:26,580 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 199 transitions. [2018-10-23 10:13:26,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-23 10:13:26,581 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:26,581 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:26,581 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:26,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:26,581 INFO L82 PathProgramCache]: Analyzing trace with hash 285645970, now seen corresponding path program 44 times [2018-10-23 10:13:26,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:26,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:26,582 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:13:26,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:26,582 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:26,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:27,902 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 137 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:27,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:27,903 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:27,903 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:27,903 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:27,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:27,903 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:27,911 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-23 10:13:27,912 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-23 10:13:27,959 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-23 10:13:27,959 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:13:27,963 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:28,028 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 137 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:28,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:34,655 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 137 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:34,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:34,675 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 95 [2018-10-23 10:13:34,675 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:34,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-23 10:13:34,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-23 10:13:34,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2395, Invalid=6535, Unknown=0, NotChecked=0, Total=8930 [2018-10-23 10:13:34,677 INFO L87 Difference]: Start difference. First operand 197 states and 199 transitions. Second operand 49 states. [2018-10-23 10:13:38,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:38,651 INFO L93 Difference]: Finished difference Result 211 states and 215 transitions. [2018-10-23 10:13:38,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-23 10:13:38,652 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 195 [2018-10-23 10:13:38,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:38,653 INFO L225 Difference]: With dead ends: 211 [2018-10-23 10:13:38,653 INFO L226 Difference]: Without dead ends: 202 [2018-10-23 10:13:38,654 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 344 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=2395, Invalid=6535, Unknown=0, NotChecked=0, Total=8930 [2018-10-23 10:13:38,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-23 10:13:38,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-23 10:13:38,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-23 10:13:38,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2018-10-23 10:13:38,661 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 195 [2018-10-23 10:13:38,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:38,661 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2018-10-23 10:13:38,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-23 10:13:38,661 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2018-10-23 10:13:38,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2018-10-23 10:13:38,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:38,662 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:38,663 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:38,663 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:38,663 INFO L82 PathProgramCache]: Analyzing trace with hash -858745862, now seen corresponding path program 45 times [2018-10-23 10:13:38,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:38,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:38,664 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:13:38,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:38,664 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:38,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:40,037 INFO L134 CoverageAnalysis]: Checked inductivity of 4418 backedges. 140 proven. 4278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:40,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:40,038 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:40,038 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:40,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:40,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:40,038 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:40,046 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-23 10:13:40,047 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-23 10:13:40,086 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-23 10:13:40,086 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-23 10:13:40,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:40,154 INFO L134 CoverageAnalysis]: Checked inductivity of 4418 backedges. 140 proven. 4278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:40,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-23 10:13:46,786 INFO L134 CoverageAnalysis]: Checked inductivity of 4418 backedges. 140 proven. 4278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:46,806 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-23 10:13:46,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 97 [2018-10-23 10:13:46,806 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-23 10:13:46,807 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-23 10:13:46,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-23 10:13:46,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2494, Invalid=6818, Unknown=0, NotChecked=0, Total=9312 [2018-10-23 10:13:46,807 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand 50 states. [2018-10-23 10:13:50,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-23 10:13:50,904 INFO L93 Difference]: Finished difference Result 215 states and 219 transitions. [2018-10-23 10:13:50,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-23 10:13:50,905 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 199 [2018-10-23 10:13:50,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-23 10:13:50,906 INFO L225 Difference]: With dead ends: 215 [2018-10-23 10:13:50,907 INFO L226 Difference]: Without dead ends: 206 [2018-10-23 10:13:50,908 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 351 SyntacticMatches, 2 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=2494, Invalid=6818, Unknown=0, NotChecked=0, Total=9312 [2018-10-23 10:13:50,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2018-10-23 10:13:50,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2018-10-23 10:13:50,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-10-23 10:13:50,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2018-10-23 10:13:50,914 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 199 [2018-10-23 10:13:50,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-23 10:13:50,914 INFO L481 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2018-10-23 10:13:50,914 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-23 10:13:50,914 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2018-10-23 10:13:50,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-23 10:13:50,915 INFO L367 BasicCegarLoop]: Found error trace [2018-10-23 10:13:50,916 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-23 10:13:50,916 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-23 10:13:50,916 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-23 10:13:50,916 INFO L82 PathProgramCache]: Analyzing trace with hash 444634978, now seen corresponding path program 46 times [2018-10-23 10:13:50,916 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-23 10:13:50,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:50,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-23 10:13:50,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-23 10:13:50,917 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-23 10:13:50,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:52,272 INFO L134 CoverageAnalysis]: Checked inductivity of 4608 backedges. 143 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:52,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:52,272 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-23 10:13:52,272 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-23 10:13:52,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-23 10:13:52,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-23 10:13:52,273 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:52,279 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-23 10:13:52,280 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-23 10:13:52,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-23 10:13:52,327 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-23 10:13:52,482 INFO L134 CoverageAnalysis]: Checked inductivity of 4608 backedges. 143 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-23 10:13:52,482 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-23 10:13:55,488 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-23 10:13:55,688 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-23 10:13:55,689 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-23 10:13:55,694 WARN L205 ceAbstractionStarter]: Timeout [2018-10-23 10:13:55,694 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 10:13:55 BoogieIcfgContainer [2018-10-23 10:13:55,694 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-23 10:13:55,695 INFO L168 Benchmark]: Toolchain (without parser) took 244507.97 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 783.8 MB). Free memory was 1.4 GB in the beginning and 2.3 GB in the end (delta: -838.6 MB). Peak memory consumption was 641.0 MB. Max. memory is 7.1 GB. [2018-10-23 10:13:55,696 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 10:13:55,696 INFO L168 Benchmark]: CACSL2BoogieTranslator took 315.22 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-23 10:13:55,697 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.60 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 10:13:55,697 INFO L168 Benchmark]: Boogie Preprocessor took 26.58 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-23 10:13:55,697 INFO L168 Benchmark]: RCFGBuilder took 365.23 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 746.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -789.2 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-23 10:13:55,698 INFO L168 Benchmark]: TraceAbstraction took 243770.55 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 37.7 MB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -59.9 MB). Peak memory consumption was 673.6 MB. Max. memory is 7.1 GB. [2018-10-23 10:13:55,701 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 315.22 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 24.60 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 26.58 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 365.23 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 746.1 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -789.2 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 243770.55 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 37.7 MB). Free memory was 2.2 GB in the beginning and 2.3 GB in the end (delta: -59.9 MB). Peak memory consumption was 673.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 2]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 2). Cancelled while BasicCegarLoop was analyzing trace of length 204 with TraceHistMax 49,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 77 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 243.6s OverallTime, 50 OverallIterations, 49 TraceHistogramMax, 75.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 1678 SDtfs, 3341 SDslu, 40793 SDs, 0 SdLazy, 109576 SolverSat, 1128 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 61.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11337 GetRequests, 8927 SyntacticMatches, 91 SemanticMatches, 2319 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 151.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=205occurred in iteration=49, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.4s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 49 MinimizatonAttempts, 47 StatesRemovedByMinimization, 47 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 1.8s SatisfiabilityAnalysisTime, 156.3s InterpolantComputationTime, 10079 NumberOfCodeBlocks, 10071 NumberOfCodeBlocksAsserted, 126 NumberOfCheckSat, 14965 ConstructedInterpolants, 10 QuantifiedInterpolants, 13005583 SizeOfPredicates, 51 NumberOfNonLiveVariables, 6989 ConjunctsInSsa, 2313 ConjunctsInUnsatCore, 143 InterpolantComputations, 4 PerfectInterpolantSequences, 10006/214320 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown