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/sum01_bug02_false-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:04:56,501 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:04:56,503 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:04:56,516 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:04:56,516 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:04:56,517 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:04:56,518 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:04:56,520 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:04:56,522 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:04:56,523 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:04:56,524 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:04:56,524 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:04:56,525 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:04:56,526 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:04:56,527 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:04:56,528 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:04:56,529 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:04:56,531 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:04:56,533 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:04:56,534 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:04:56,536 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:04:56,537 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:04:56,539 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:04:56,540 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:04:56,540 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:04:56,541 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:04:56,542 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:04:56,543 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:04:56,543 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:04:56,545 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:04:56,545 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:04:56,546 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:04:56,548 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 [2018-10-24 12:04:56,564 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:04:56,564 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:04:56,565 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:04:56,565 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:04:56,566 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:04:56,566 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:04:56,566 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:04:56,566 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:04:56,567 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:04:56,567 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:04:56,567 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:04:56,567 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:04:56,571 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:04:56,571 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:04:56,572 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:04:56,572 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:04:56,572 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:04:56,572 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:04:56,572 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:04:56,577 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:04:56,577 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:04:56,577 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:04:56,578 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:04:56,578 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:04:56,578 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:04:56,578 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:04:56,578 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:04:56,579 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:04:56,579 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:04:56,579 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:04:56,579 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:04:56,580 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:04:56,580 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:04:56,580 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:04:56,628 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:04:56,642 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:04:56,646 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:04:56,648 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:04:56,648 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:04:56,649 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/sum01_bug02_false-unreach-call_true-termination.i [2018-10-24 12:04:56,709 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/67730cccb/3349cdaa1097449989684a2bbb6d22ef/FLAG9458dae5d [2018-10-24 12:04:57,138 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:04:57,139 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_false-unreach-call_true-termination.i [2018-10-24 12:04:57,146 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/67730cccb/3349cdaa1097449989684a2bbb6d22ef/FLAG9458dae5d [2018-10-24 12:04:57,163 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/67730cccb/3349cdaa1097449989684a2bbb6d22ef [2018-10-24 12:04:57,176 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:04:57,178 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:04:57,180 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:04:57,180 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:04:57,184 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:04:57,185 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,188 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64b8a232 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57, skipping insertion in model container [2018-10-24 12:04:57,188 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,199 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:04:57,222 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:04:57,439 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:04:57,443 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:04:57,460 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:04:57,474 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:04:57,474 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57 WrapperNode [2018-10-24 12:04:57,474 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:04:57,475 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:04:57,475 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:04:57,476 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:04:57,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,491 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,497 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:04:57,498 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:04:57,498 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:04:57,498 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:04:57,509 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,510 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,510 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,511 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,514 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,519 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,520 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (1/1) ... [2018-10-24 12:04:57,521 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:04:57,522 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:04:57,522 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:04:57,522 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:04:57,523 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (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 [2018-10-24 12:04:57,650 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:04:57,650 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:04:57,651 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:04:57,651 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:04:57,651 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:04:57,651 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:04:57,651 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:04:57,652 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:04:58,035 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:04:58,037 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:04:58 BoogieIcfgContainer [2018-10-24 12:04:58,037 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:04:58,045 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:04:58,046 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:04:58,056 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:04:58,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:04:57" (1/3) ... [2018-10-24 12:04:58,060 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f786f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:04:58, skipping insertion in model container [2018-10-24 12:04:58,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:04:57" (2/3) ... [2018-10-24 12:04:58,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f786f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:04:58, skipping insertion in model container [2018-10-24 12:04:58,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:04:58" (3/3) ... [2018-10-24 12:04:58,067 INFO L112 eAbstractionObserver]: Analyzing ICFG sum01_bug02_false-unreach-call_true-termination.i [2018-10-24 12:04:58,089 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:04:58,105 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:04:58,128 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:04:58,167 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:04:58,167 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:04:58,167 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:04:58,168 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:04:58,168 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:04:58,168 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:04:58,168 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:04:58,168 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:04:58,188 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-24 12:04:58,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-24 12:04:58,194 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:58,195 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:58,198 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:58,204 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:58,205 INFO L82 PathProgramCache]: Analyzing trace with hash -2007171518, now seen corresponding path program 1 times [2018-10-24 12:04:58,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:58,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,257 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:58,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,257 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:58,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:58,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:58,324 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:58,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:04:58,325 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:58,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:04:58,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:04:58,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:04:58,346 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-24 12:04:58,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:58,368 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-24 12:04:58,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:04:58,370 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-24 12:04:58,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:58,380 INFO L225 Difference]: With dead ends: 32 [2018-10-24 12:04:58,380 INFO L226 Difference]: Without dead ends: 15 [2018-10-24 12:04:58,384 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 [2018-10-24 12:04:58,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-24 12:04:58,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-24 12:04:58,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-24 12:04:58,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-24 12:04:58,421 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-10-24 12:04:58,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:58,422 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-24 12:04:58,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:04:58,422 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-24 12:04:58,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-24 12:04:58,423 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:58,423 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:58,424 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:58,424 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:58,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1715017247, now seen corresponding path program 1 times [2018-10-24 12:04:58,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:58,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,426 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:58,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,426 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:58,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:58,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:58,715 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:04:58,715 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:04:58,715 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:04:58,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:04:58,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:04:58,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:04:58,719 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2018-10-24 12:04:58,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:04:58,821 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2018-10-24 12:04:58,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:04:58,822 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-24 12:04:58,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:04:58,823 INFO L225 Difference]: With dead ends: 25 [2018-10-24 12:04:58,823 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 12:04:58,824 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:04:58,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 12:04:58,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 12:04:58,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:04:58,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2018-10-24 12:04:58,830 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 11 [2018-10-24 12:04:58,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:04:58,830 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2018-10-24 12:04:58,831 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:04:58,831 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2018-10-24 12:04:58,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:04:58,832 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:04:58,832 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:04:58,833 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:04:58,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:04:58,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1428843034, now seen corresponding path program 1 times [2018-10-24 12:04:58,834 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:04:58,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,835 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:04:58,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:04:58,836 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:04:58,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:04:59,300 WARN L179 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 14 [2018-10-24 12:04:59,485 WARN L179 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 12 DAG size of output: 9 [2018-10-24 12:04:59,553 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:04:59,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:04:59,554 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:04:59,555 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-10-24 12:04:59,556 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [16], [20], [22], [28], [31], [33], [39], [40], [41], [43] [2018-10-24 12:04:59,611 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:04:59,611 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:04:59,741 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:05:00,307 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:05:00,309 INFO L272 AbstractInterpreter]: Visited 15 different actions 204 times. Merged at 6 different actions 114 times. Widened at 1 different actions 15 times. Found 1 fixpoints after 1 different actions. Largest state had 7 variables. [2018-10-24 12:05:00,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:00,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:05:00,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:00,332 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 [2018-10-24 12:05:00,341 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:00,342 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:00,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:00,379 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:00,596 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-24 12:05:00,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:00,860 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:01,592 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:01,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:01,616 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 21 [2018-10-24 12:05:01,616 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:01,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:05:01,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:05:01,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:05:01,619 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 14 states. [2018-10-24 12:05:02,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:02,065 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2018-10-24 12:05:02,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:05:02,065 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 16 [2018-10-24 12:05:02,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:02,070 INFO L225 Difference]: With dead ends: 45 [2018-10-24 12:05:02,070 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:05:02,071 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:05:02,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:05:02,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 32. [2018-10-24 12:05:02,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-24 12:05:02,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2018-10-24 12:05:02,079 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 16 [2018-10-24 12:05:02,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:02,080 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2018-10-24 12:05:02,080 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:05:02,080 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2018-10-24 12:05:02,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-24 12:05:02,081 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:02,081 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:02,082 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:02,082 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:02,082 INFO L82 PathProgramCache]: Analyzing trace with hash -1947322111, now seen corresponding path program 1 times [2018-10-24 12:05:02,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:02,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:02,083 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:02,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:02,084 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:02,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:02,155 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:02,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:02,156 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:02,156 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-10-24 12:05:02,157 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [16], [18], [20], [22], [28], [31], [33], [39], [40], [41], [43] [2018-10-24 12:05:02,159 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 12:05:02,160 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:05:02,173 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-24 12:05:02,915 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:05:02,916 INFO L272 AbstractInterpreter]: Visited 16 different actions 504 times. Merged at 7 different actions 284 times. Widened at 1 different actions 37 times. Found 38 fixpoints after 2 different actions. Largest state had 7 variables. [2018-10-24 12:05:02,953 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:02,953 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:05:02,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:02,954 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 [2018-10-24 12:05:02,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:02,963 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:02,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:02,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:03,065 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:03,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:03,128 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:03,153 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:03,154 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 11 [2018-10-24 12:05:03,154 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:03,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-24 12:05:03,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-24 12:05:03,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:05:03,156 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 8 states. [2018-10-24 12:05:03,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:03,299 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2018-10-24 12:05:03,301 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:05:03,301 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-24 12:05:03,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:03,302 INFO L225 Difference]: With dead ends: 42 [2018-10-24 12:05:03,302 INFO L226 Difference]: Without dead ends: 27 [2018-10-24 12:05:03,303 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:05:03,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-24 12:05:03,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-24 12:05:03,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:05:03,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-24 12:05:03,308 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 21 [2018-10-24 12:05:03,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:03,309 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-24 12:05:03,309 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-24 12:05:03,309 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-24 12:05:03,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:05:03,310 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:03,310 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:03,310 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:03,311 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:03,311 INFO L82 PathProgramCache]: Analyzing trace with hash 994455866, now seen corresponding path program 2 times [2018-10-24 12:05:03,311 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:03,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:03,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:03,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:03,312 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:03,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:03,678 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-10-24 12:05:03,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:03,678 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:03,678 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:03,679 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:03,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:03,679 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 [2018-10-24 12:05:03,687 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:03,687 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:03,710 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:05:03,710 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:03,714 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:04,049 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:04,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:04,589 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:04,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:04,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13] total 30 [2018-10-24 12:05:04,610 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:04,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:05:04,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:05:04,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=745, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:05:04,613 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 19 states. [2018-10-24 12:05:05,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:05,376 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2018-10-24 12:05:05,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:05:05,376 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2018-10-24 12:05:05,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:05,377 INFO L225 Difference]: With dead ends: 50 [2018-10-24 12:05:05,377 INFO L226 Difference]: Without dead ends: 44 [2018-10-24 12:05:05,379 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=288, Invalid=1604, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:05:05,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-24 12:05:05,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 28. [2018-10-24 12:05:05,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-24 12:05:05,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2018-10-24 12:05:05,386 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 26 [2018-10-24 12:05:05,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:05,386 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2018-10-24 12:05:05,386 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:05:05,386 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2018-10-24 12:05:05,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:05:05,387 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:05,388 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:05,388 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:05,388 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:05,388 INFO L82 PathProgramCache]: Analyzing trace with hash 1674514236, now seen corresponding path program 2 times [2018-10-24 12:05:05,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:05,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:05,390 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:05,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:05,390 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:05,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:05,458 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:05,458 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:05,459 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:05,459 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:05,459 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:05,459 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:05,459 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 [2018-10-24 12:05:05,469 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:05:05,470 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:05:05,493 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:05:05,493 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:05,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:05,604 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:05,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:05,685 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:05,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:05,716 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2018-10-24 12:05:05,717 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:05,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:05:05,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:05:05,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=130, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:05:05,718 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 12 states. [2018-10-24 12:05:05,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:05,786 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2018-10-24 12:05:05,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:05:05,792 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2018-10-24 12:05:05,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:05,793 INFO L225 Difference]: With dead ends: 44 [2018-10-24 12:05:05,793 INFO L226 Difference]: Without dead ends: 34 [2018-10-24 12:05:05,794 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=130, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:05:05,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-24 12:05:05,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-24 12:05:05,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-24 12:05:05,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-10-24 12:05:05,801 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 26 [2018-10-24 12:05:05,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:05,802 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-10-24 12:05:05,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:05:05,802 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-10-24 12:05:05,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-24 12:05:05,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:05,803 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:05,804 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:05,804 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:05,804 INFO L82 PathProgramCache]: Analyzing trace with hash 162653665, now seen corresponding path program 3 times [2018-10-24 12:05:05,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:05,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:05,805 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:05,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:05,806 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:05,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:05,950 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 14 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:05,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:05,951 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:05,951 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:05,951 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:05,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:05,952 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 [2018-10-24 12:05:05,960 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:05:05,960 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:05:05,981 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:05:05,981 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:05:05,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:06,101 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 14 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:06,102 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:06,188 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 14 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:06,209 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:06,209 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2018-10-24 12:05:06,209 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:06,209 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:05:06,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:05:06,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=174, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:05:06,210 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 16 states. [2018-10-24 12:05:06,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:06,336 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2018-10-24 12:05:06,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:05:06,338 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 31 [2018-10-24 12:05:06,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:06,339 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:05:06,339 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:05:06,340 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=132, Invalid=174, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:05:06,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:05:06,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-10-24 12:05:06,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-24 12:05:06,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-10-24 12:05:06,347 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 31 [2018-10-24 12:05:06,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:06,347 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-10-24 12:05:06,348 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:05:06,348 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-10-24 12:05:06,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-24 12:05:06,349 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:06,349 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:06,349 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:06,350 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:06,350 INFO L82 PathProgramCache]: Analyzing trace with hash 129265244, now seen corresponding path program 4 times [2018-10-24 12:05:06,350 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:06,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:06,351 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:05:06,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:06,352 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:06,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:06,570 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:06,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:06,570 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:05:06,570 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:05:06,570 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:05:06,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:05:06,571 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 [2018-10-24 12:05:06,599 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:06,599 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:05:06,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:05:06,618 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:05:06,737 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:06,737 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:05:06,969 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:05:07,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:05:07,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-24 12:05:07,006 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:05:07,007 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:05:07,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:05:07,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=226, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:05:07,009 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 20 states. [2018-10-24 12:05:07,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:05:07,344 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2018-10-24 12:05:07,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:05:07,344 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 36 [2018-10-24 12:05:07,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:05:07,346 INFO L225 Difference]: With dead ends: 55 [2018-10-24 12:05:07,346 INFO L226 Difference]: Without dead ends: 45 [2018-10-24 12:05:07,347 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 55 SyntacticMatches, 9 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=226, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:05:07,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-24 12:05:07,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-10-24 12:05:07,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-24 12:05:07,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2018-10-24 12:05:07,353 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 36 [2018-10-24 12:05:07,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:05:07,354 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2018-10-24 12:05:07,354 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:05:07,354 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2018-10-24 12:05:07,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-24 12:05:07,355 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:05:07,355 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:05:07,356 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:05:07,356 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:05:07,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1609235137, now seen corresponding path program 5 times [2018-10-24 12:05:07,356 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:05:07,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:07,357 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:05:07,357 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:05:07,357 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:05:07,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-24 12:05:07,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-24 12:05:07,402 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-24 12:05:07,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:05:07 BoogieIcfgContainer [2018-10-24 12:05:07,447 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:05:07,448 INFO L168 Benchmark]: Toolchain (without parser) took 10270.48 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 848.3 MB). Free memory was 1.3 GB in the beginning and 2.2 GB in the end (delta: -839.0 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2018-10-24 12:05:07,449 INFO L168 Benchmark]: CDTParser took 0.24 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. [2018-10-24 12:05:07,449 INFO L168 Benchmark]: CACSL2BoogieTranslator took 295.13 ms. Allocated memory is still 1.5 GB. Free memory was 1.3 GB in the beginning and 1.3 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:05:07,450 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.37 ms. Allocated memory is still 1.5 GB. Free memory is still 1.3 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:05:07,451 INFO L168 Benchmark]: Boogie Preprocessor took 23.83 ms. Allocated memory is still 1.5 GB. Free memory is still 1.3 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:05:07,451 INFO L168 Benchmark]: RCFGBuilder took 515.38 ms. Allocated memory was 1.5 GB in the beginning and 2.1 GB in the end (delta: 661.1 MB). Free memory was 1.3 GB in the beginning and 2.0 GB in the end (delta: -708.0 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-24 12:05:07,454 INFO L168 Benchmark]: TraceAbstraction took 9401.55 ms. Allocated memory was 2.1 GB in the beginning and 2.3 GB in the end (delta: 187.2 MB). Free memory was 2.0 GB in the beginning and 2.2 GB in the end (delta: -141.6 MB). Peak memory consumption was 45.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:05:07,461 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 295.13 ms. Allocated memory is still 1.5 GB. Free memory was 1.3 GB in the beginning and 1.3 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 22.37 ms. Allocated memory is still 1.5 GB. Free memory is still 1.3 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.83 ms. Allocated memory is still 1.5 GB. Free memory is still 1.3 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 515.38 ms. Allocated memory was 1.5 GB in the beginning and 2.1 GB in the end (delta: 661.1 MB). Free memory was 1.3 GB in the beginning and 2.0 GB in the end (delta: -708.0 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9401.55 ms. Allocated memory was 2.1 GB in the beginning and 2.3 GB in the end (delta: 187.2 MB). Free memory was 2.0 GB in the beginning and 2.2 GB in the end (delta: -141.6 MB). Peak memory consumption was 45.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 VAL [i=1, j=10, n=6, n=0] [L13] COND TRUE i<=n VAL [i=1, j=10, n=0, n=6] [L14] COND TRUE i