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-INT.epf -i ../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 15:42:12,505 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 15:42:12,509 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 15:42:12,527 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 15:42:12,528 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 15:42:12,529 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 15:42:12,531 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 15:42:12,533 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 15:42:12,535 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 15:42:12,535 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 15:42:12,538 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 15:42:12,539 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 15:42:12,540 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 15:42:12,541 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 15:42:12,545 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 15:42:12,546 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 15:42:12,554 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 15:42:12,555 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 15:42:12,561 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 15:42:12,563 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 15:42:12,566 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 15:42:12,567 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 15:42:12,570 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 15:42:12,570 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 15:42:12,571 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 15:42:12,574 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 15:42:12,575 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 15:42:12,575 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 15:42:12,578 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 15:42:12,581 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 15:42:12,582 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 15:42:12,583 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 15:42:12,585 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-10-27 15:42:12,600 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 15:42:12,600 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 15:42:12,601 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 15:42:12,601 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 15:42:12,601 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 15:42:12,601 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 15:42:12,602 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 15:42:12,602 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 15:42:12,602 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 15:42:12,602 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 15:42:12,602 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 15:42:12,603 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 15:42:12,603 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 15:42:12,603 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 15:42:12,604 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 15:42:12,604 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 15:42:12,604 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 15:42:12,604 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 15:42:12,604 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 15:42:12,605 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 15:42:12,605 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 15:42:12,605 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 15:42:12,605 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 15:42:12,605 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 15:42:12,605 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 15:42:12,606 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 15:42:12,606 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 15:42:12,606 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 15:42:12,606 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 15:42:12,606 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 15:42:12,607 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 15:42:12,607 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 15:42:12,607 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 15:42:12,607 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 15:42:12,652 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 15:42:12,666 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 15:42:12,669 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 15:42:12,671 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 15:42:12,671 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 15:42:12,672 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-27 15:42:12,734 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/f7f93fb9f/0a38d3e6fbaa4461a95a74c619057e91/FLAG719f3f237 [2018-10-27 15:42:13,185 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 15:42:13,186 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/count_by_nondet_true-unreach-call_true-termination.i [2018-10-27 15:42:13,193 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/f7f93fb9f/0a38d3e6fbaa4461a95a74c619057e91/FLAG719f3f237 [2018-10-27 15:42:13,209 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/f7f93fb9f/0a38d3e6fbaa4461a95a74c619057e91 [2018-10-27 15:42:13,221 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 15:42:13,222 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 15:42:13,224 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 15:42:13,224 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 15:42:13,232 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 15:42:13,233 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,236 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f0b6039 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13, skipping insertion in model container [2018-10-27 15:42:13,237 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,247 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 15:42:13,272 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 15:42:13,467 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:42:13,472 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 15:42:13,494 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 15:42:13,512 INFO L193 MainTranslator]: Completed translation [2018-10-27 15:42:13,512 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13 WrapperNode [2018-10-27 15:42:13,513 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 15:42:13,514 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 15:42:13,514 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 15:42:13,514 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 15:42:13,524 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,530 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,537 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 15:42:13,538 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 15:42:13,538 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 15:42:13,538 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 15:42:13,549 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,550 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,550 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,551 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,556 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,565 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,566 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (1/1) ... [2018-10-27 15:42:13,567 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 15:42:13,568 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 15:42:13,568 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 15:42:13,568 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 15:42:13,569 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (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 [2018-10-27 15:42:13,643 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 15:42:13,643 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 15:42:13,644 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 15:42:13,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 15:42:13,644 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 15:42:13,644 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 15:42:13,644 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 15:42:13,644 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 15:42:13,952 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 15:42:13,952 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:42:13 BoogieIcfgContainer [2018-10-27 15:42:13,953 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 15:42:13,954 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 15:42:13,954 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 15:42:13,957 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 15:42:13,957 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 03:42:13" (1/3) ... [2018-10-27 15:42:13,958 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ee3709f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:42:13, skipping insertion in model container [2018-10-27 15:42:13,958 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 03:42:13" (2/3) ... [2018-10-27 15:42:13,959 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ee3709f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 03:42:13, skipping insertion in model container [2018-10-27 15:42:13,959 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 03:42:13" (3/3) ... [2018-10-27 15:42:13,961 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_nondet_true-unreach-call_true-termination.i [2018-10-27 15:42:13,972 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 15:42:13,980 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 15:42:14,004 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 15:42:14,046 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 15:42:14,047 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 15:42:14,047 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 15:42:14,047 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 15:42:14,047 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 15:42:14,047 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 15:42:14,047 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 15:42:14,048 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 15:42:14,070 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-27 15:42:14,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 15:42:14,077 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:14,079 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:14,081 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:14,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:14,089 INFO L82 PathProgramCache]: Analyzing trace with hash -722424895, now seen corresponding path program 1 times [2018-10-27 15:42:14,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:14,152 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:14,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:14,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:14,153 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:14,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:14,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:14,237 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:42:14,237 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 15:42:14,237 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:42:14,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 15:42:14,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 15:42:14,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 15:42:14,255 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-27 15:42:14,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:14,274 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2018-10-27 15:42:14,275 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 15:42:14,276 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 15:42:14,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:14,285 INFO L225 Difference]: With dead ends: 32 [2018-10-27 15:42:14,285 INFO L226 Difference]: Without dead ends: 13 [2018-10-27 15:42:14,289 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 [2018-10-27 15:42:14,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-27 15:42:14,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-27 15:42:14,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-27 15:42:14,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-27 15:42:14,323 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-27 15:42:14,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:14,324 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-27 15:42:14,324 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 15:42:14,324 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-27 15:42:14,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 15:42:14,325 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:14,325 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:14,326 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:14,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:14,327 INFO L82 PathProgramCache]: Analyzing trace with hash -1289299715, now seen corresponding path program 1 times [2018-10-27 15:42:14,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:14,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:14,328 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:14,328 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:14,329 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:14,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:14,420 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:14,421 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 15:42:14,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 15:42:14,421 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 15:42:14,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 15:42:14,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 15:42:14,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:42:14,424 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 3 states. [2018-10-27 15:42:14,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:14,454 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 15:42:14,454 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 15:42:14,455 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 15:42:14,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:14,456 INFO L225 Difference]: With dead ends: 21 [2018-10-27 15:42:14,456 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 15:42:14,457 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 15:42:14,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 15:42:14,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-10-27 15:42:14,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-27 15:42:14,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-27 15:42:14,462 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2018-10-27 15:42:14,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:14,462 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-27 15:42:14,462 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 15:42:14,462 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-27 15:42:14,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-27 15:42:14,463 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:14,463 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:14,464 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:14,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:14,464 INFO L82 PathProgramCache]: Analyzing trace with hash 1003978365, now seen corresponding path program 1 times [2018-10-27 15:42:14,464 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:14,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:14,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:14,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:14,466 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:14,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:14,550 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:14,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:14,550 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:14,552 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-10-27 15:42:14,554 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [25], [28], [30], [36], [37], [38], [40] [2018-10-27 15:42:14,588 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-10-27 15:42:14,588 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 15:42:14,806 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 15:42:14,808 INFO L272 AbstractInterpreter]: Visited 13 different actions 61 times. Merged at 4 different actions 26 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2018-10-27 15:42:14,823 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:14,825 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 15:42:14,825 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:14,825 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 [2018-10-27 15:42:14,843 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:14,843 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:14,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:14,883 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:14,909 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:14,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:14,977 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:14,998 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:14,999 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2018-10-27 15:42:14,999 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:14,999 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 15:42:15,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 15:42:15,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 15:42:15,000 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 4 states. [2018-10-27 15:42:15,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:15,077 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-27 15:42:15,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 15:42:15,078 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-10-27 15:42:15,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:15,078 INFO L225 Difference]: With dead ends: 23 [2018-10-27 15:42:15,078 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 15:42:15,079 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-27 15:42:15,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 15:42:15,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 15:42:15,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 15:42:15,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-27 15:42:15,083 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2018-10-27 15:42:15,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:15,083 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-27 15:42:15,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 15:42:15,084 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-27 15:42:15,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 15:42:15,084 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:15,085 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:15,085 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:15,085 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:15,085 INFO L82 PathProgramCache]: Analyzing trace with hash 6482173, now seen corresponding path program 2 times [2018-10-27 15:42:15,086 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:15,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:15,087 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:15,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:15,087 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:15,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:15,245 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:15,245 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:15,245 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:15,245 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:15,246 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:15,246 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:15,246 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 [2018-10-27 15:42:15,255 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:15,255 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:15,298 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 15:42:15,298 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:15,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:15,382 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:15,382 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:15,692 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:15,716 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:15,716 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 15:42:15,716 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:15,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 15:42:15,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 15:42:15,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-10-27 15:42:15,718 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 7 states. [2018-10-27 15:42:15,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:15,789 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 15:42:15,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 15:42:15,790 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2018-10-27 15:42:15,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:15,792 INFO L225 Difference]: With dead ends: 27 [2018-10-27 15:42:15,792 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 15:42:15,793 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-10-27 15:42:15,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 15:42:15,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-27 15:42:15,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-27 15:42:15,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-27 15:42:15,799 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 17 [2018-10-27 15:42:15,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:15,799 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-27 15:42:15,799 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 15:42:15,799 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-27 15:42:15,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-27 15:42:15,800 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:15,800 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:15,801 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:15,801 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:15,801 INFO L82 PathProgramCache]: Analyzing trace with hash 476147325, now seen corresponding path program 3 times [2018-10-27 15:42:15,801 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:15,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:15,802 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:15,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:15,803 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:15,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:16,006 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:16,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:16,007 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:16,007 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:16,007 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:16,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:16,007 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 [2018-10-27 15:42:16,017 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:16,017 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:16,037 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:16,037 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:16,039 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:16,073 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:16,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:16,207 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:16,232 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:16,232 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 15:42:16,232 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:16,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 15:42:16,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 15:42:16,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-10-27 15:42:16,234 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2018-10-27 15:42:16,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:16,530 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-10-27 15:42:16,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 15:42:16,533 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-10-27 15:42:16,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:16,534 INFO L225 Difference]: With dead ends: 30 [2018-10-27 15:42:16,534 INFO L226 Difference]: Without dead ends: 25 [2018-10-27 15:42:16,535 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2018-10-27 15:42:16,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-27 15:42:16,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2018-10-27 15:42:16,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 15:42:16,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-27 15:42:16,544 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-10-27 15:42:16,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:16,546 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-27 15:42:16,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 15:42:16,546 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-27 15:42:16,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 15:42:16,547 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:16,547 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:16,553 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:16,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:16,553 INFO L82 PathProgramCache]: Analyzing trace with hash -732759811, now seen corresponding path program 4 times [2018-10-27 15:42:16,554 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:16,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:16,555 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:16,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:16,555 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:16,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:16,735 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:16,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:16,736 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:16,736 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:16,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:16,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:16,736 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 [2018-10-27 15:42:16,750 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:16,751 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:16,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:16,769 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:16,796 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:16,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:16,939 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:16,962 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:16,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 15:42:16,962 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:16,963 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 15:42:16,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 15:42:16,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=164, Unknown=0, NotChecked=0, Total=240 [2018-10-27 15:42:16,964 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-27 15:42:17,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:17,005 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 15:42:17,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 15:42:17,006 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 15:42:17,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:17,008 INFO L225 Difference]: With dead ends: 33 [2018-10-27 15:42:17,008 INFO L226 Difference]: Without dead ends: 28 [2018-10-27 15:42:17,008 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2018-10-27 15:42:17,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-27 15:42:17,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-10-27 15:42:17,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-27 15:42:17,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-27 15:42:17,014 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-10-27 15:42:17,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:17,014 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-27 15:42:17,014 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 15:42:17,015 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-27 15:42:17,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-27 15:42:17,015 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:17,016 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:17,016 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:17,016 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:17,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1984471427, now seen corresponding path program 5 times [2018-10-27 15:42:17,016 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:17,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:17,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:17,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:17,018 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:17,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:17,230 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:17,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:17,230 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:17,230 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:17,231 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:17,231 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:17,231 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 [2018-10-27 15:42:17,242 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:17,242 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:17,286 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 15:42:17,286 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:17,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:17,330 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:17,330 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:17,628 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:17,657 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:17,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 15:42:17,658 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:17,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 15:42:17,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 15:42:17,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=205, Unknown=0, NotChecked=0, Total=306 [2018-10-27 15:42:17,660 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 10 states. [2018-10-27 15:42:17,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:17,709 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-10-27 15:42:17,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 15:42:17,710 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-27 15:42:17,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:17,710 INFO L225 Difference]: With dead ends: 36 [2018-10-27 15:42:17,711 INFO L226 Difference]: Without dead ends: 31 [2018-10-27 15:42:17,711 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2018-10-27 15:42:17,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-27 15:42:17,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-10-27 15:42:17,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 15:42:17,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-27 15:42:17,717 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-10-27 15:42:17,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:17,717 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-27 15:42:17,717 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 15:42:17,717 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-27 15:42:17,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 15:42:17,718 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:17,718 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:17,718 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:17,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:17,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1475807485, now seen corresponding path program 6 times [2018-10-27 15:42:17,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:17,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:17,720 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:17,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:17,720 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:17,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:17,899 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:17,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:17,900 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:17,900 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:17,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:17,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:17,901 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 [2018-10-27 15:42:17,909 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:17,910 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:17,952 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:17,952 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:17,955 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:17,989 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:17,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:18,359 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:18,381 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:18,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 15:42:18,382 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:18,383 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 15:42:18,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 15:42:18,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=250, Unknown=0, NotChecked=0, Total=380 [2018-10-27 15:42:18,384 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 11 states. [2018-10-27 15:42:18,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:18,438 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 15:42:18,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 15:42:18,439 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2018-10-27 15:42:18,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:18,440 INFO L225 Difference]: With dead ends: 39 [2018-10-27 15:42:18,440 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 15:42:18,441 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2018-10-27 15:42:18,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 15:42:18,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-10-27 15:42:18,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-27 15:42:18,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-27 15:42:18,446 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-10-27 15:42:18,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:18,447 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-27 15:42:18,447 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 15:42:18,447 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-27 15:42:18,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-27 15:42:18,448 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:18,448 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:18,448 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:18,448 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:18,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1160163715, now seen corresponding path program 7 times [2018-10-27 15:42:18,449 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:18,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:18,450 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:18,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:18,450 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:18,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:18,601 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:18,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:18,602 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:18,602 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:18,602 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:18,602 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:18,603 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 [2018-10-27 15:42:18,610 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:18,610 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:18,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:18,630 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:18,658 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:18,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:18,871 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:18,892 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:18,893 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 15:42:18,893 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:18,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 15:42:18,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 15:42:18,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=299, Unknown=0, NotChecked=0, Total=462 [2018-10-27 15:42:18,896 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 12 states. [2018-10-27 15:42:19,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:19,059 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-10-27 15:42:19,059 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 15:42:19,060 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2018-10-27 15:42:19,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:19,062 INFO L225 Difference]: With dead ends: 42 [2018-10-27 15:42:19,062 INFO L226 Difference]: Without dead ends: 37 [2018-10-27 15:42:19,063 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2018-10-27 15:42:19,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-27 15:42:19,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-10-27 15:42:19,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 15:42:19,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-27 15:42:19,067 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-10-27 15:42:19,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:19,067 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-27 15:42:19,068 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 15:42:19,068 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-27 15:42:19,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 15:42:19,069 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:19,069 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:19,069 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:19,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:19,069 INFO L82 PathProgramCache]: Analyzing trace with hash -196142851, now seen corresponding path program 8 times [2018-10-27 15:42:19,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:19,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:19,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:19,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:19,071 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:19,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:19,259 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:19,260 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:19,260 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:19,260 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:19,261 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:19,261 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:19,261 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 [2018-10-27 15:42:19,271 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:19,272 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:19,299 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 15:42:19,300 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:19,304 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:19,339 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:19,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:19,587 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:19,608 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:19,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 15:42:19,608 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:19,609 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 15:42:19,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 15:42:19,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-10-27 15:42:19,610 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 13 states. [2018-10-27 15:42:19,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:19,703 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 15:42:19,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 15:42:19,704 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2018-10-27 15:42:19,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:19,705 INFO L225 Difference]: With dead ends: 45 [2018-10-27 15:42:19,705 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 15:42:19,706 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2018-10-27 15:42:19,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 15:42:19,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-10-27 15:42:19,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-27 15:42:19,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-27 15:42:19,714 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-10-27 15:42:19,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:19,714 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-27 15:42:19,714 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 15:42:19,714 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-27 15:42:19,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-27 15:42:19,715 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:19,716 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:19,716 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:19,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:19,716 INFO L82 PathProgramCache]: Analyzing trace with hash -1496891779, now seen corresponding path program 9 times [2018-10-27 15:42:19,716 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:19,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:19,717 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:19,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:19,718 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:19,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:19,908 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:19,908 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:19,908 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:19,908 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:19,909 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:19,909 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:19,909 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 [2018-10-27 15:42:19,917 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:19,918 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:19,964 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:19,964 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:19,967 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:19,992 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:19,992 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:20,365 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:20,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:20,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 15:42:20,387 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:20,387 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 15:42:20,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 15:42:20,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=409, Unknown=0, NotChecked=0, Total=650 [2018-10-27 15:42:20,389 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 14 states. [2018-10-27 15:42:20,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:20,453 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-10-27 15:42:20,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 15:42:20,454 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2018-10-27 15:42:20,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:20,455 INFO L225 Difference]: With dead ends: 48 [2018-10-27 15:42:20,455 INFO L226 Difference]: Without dead ends: 43 [2018-10-27 15:42:20,456 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2018-10-27 15:42:20,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-10-27 15:42:20,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-10-27 15:42:20,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 15:42:20,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-27 15:42:20,461 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-10-27 15:42:20,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:20,462 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-27 15:42:20,462 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 15:42:20,462 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-27 15:42:20,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 15:42:20,463 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:20,463 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:20,463 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:20,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:20,464 INFO L82 PathProgramCache]: Analyzing trace with hash 1381705981, now seen corresponding path program 10 times [2018-10-27 15:42:20,464 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:20,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:20,465 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:20,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:20,465 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:20,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:20,996 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:20,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:20,997 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:20,997 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:20,998 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:20,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:20,998 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 [2018-10-27 15:42:21,007 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:21,007 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:21,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:21,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:21,101 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:21,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:21,395 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:21,416 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:21,416 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 15:42:21,416 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:21,417 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 15:42:21,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 15:42:21,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=470, Unknown=0, NotChecked=0, Total=756 [2018-10-27 15:42:21,418 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 15 states. [2018-10-27 15:42:21,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:21,519 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 15:42:21,519 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 15:42:21,519 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2018-10-27 15:42:21,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:21,521 INFO L225 Difference]: With dead ends: 51 [2018-10-27 15:42:21,521 INFO L226 Difference]: Without dead ends: 46 [2018-10-27 15:42:21,522 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2018-10-27 15:42:21,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-27 15:42:21,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-10-27 15:42:21,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-10-27 15:42:21,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-10-27 15:42:21,527 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-10-27 15:42:21,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:21,527 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-10-27 15:42:21,527 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 15:42:21,528 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-10-27 15:42:21,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-27 15:42:21,530 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:21,530 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:21,530 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:21,530 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:21,531 INFO L82 PathProgramCache]: Analyzing trace with hash 75574909, now seen corresponding path program 11 times [2018-10-27 15:42:21,531 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:21,531 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:21,532 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:21,532 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:21,532 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:21,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:21,782 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:21,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:21,783 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:21,783 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:21,783 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:21,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:21,783 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 [2018-10-27 15:42:21,791 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:21,791 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:21,828 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 15:42:21,828 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:21,833 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:22,083 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:22,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:22,423 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:22,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:22,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 15:42:22,444 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:22,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 15:42:22,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 15:42:22,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=535, Unknown=0, NotChecked=0, Total=870 [2018-10-27 15:42:22,446 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 16 states. [2018-10-27 15:42:22,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:22,542 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-10-27 15:42:22,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 15:42:22,543 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2018-10-27 15:42:22,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:22,544 INFO L225 Difference]: With dead ends: 54 [2018-10-27 15:42:22,544 INFO L226 Difference]: Without dead ends: 49 [2018-10-27 15:42:22,545 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=341, Invalid=589, Unknown=0, NotChecked=0, Total=930 [2018-10-27 15:42:22,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-27 15:42:22,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-10-27 15:42:22,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 15:42:22,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-27 15:42:22,552 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-10-27 15:42:22,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:22,553 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-27 15:42:22,553 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 15:42:22,553 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-27 15:42:22,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 15:42:22,554 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:22,554 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:22,554 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:22,554 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:22,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1528510717, now seen corresponding path program 12 times [2018-10-27 15:42:22,555 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:22,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:22,556 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:22,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:22,556 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:22,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:22,788 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:22,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:22,788 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:22,788 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:22,789 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:22,789 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:22,789 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 [2018-10-27 15:42:22,797 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:22,797 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:22,819 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:22,819 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:22,822 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:22,894 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:22,895 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:23,205 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:23,227 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:23,227 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 15:42:23,227 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:23,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 15:42:23,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 15:42:23,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=388, Invalid=604, Unknown=0, NotChecked=0, Total=992 [2018-10-27 15:42:23,229 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 17 states. [2018-10-27 15:42:23,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:23,298 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 15:42:23,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 15:42:23,304 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 47 [2018-10-27 15:42:23,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:23,305 INFO L225 Difference]: With dead ends: 57 [2018-10-27 15:42:23,305 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 15:42:23,306 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 15:42:23,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 15:42:23,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-10-27 15:42:23,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-10-27 15:42:23,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-10-27 15:42:23,316 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-10-27 15:42:23,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:23,316 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-10-27 15:42:23,316 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 15:42:23,316 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-10-27 15:42:23,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-10-27 15:42:23,317 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:23,317 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:23,318 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:23,318 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:23,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1258757757, now seen corresponding path program 13 times [2018-10-27 15:42:23,318 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:23,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:23,319 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:23,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:23,319 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:23,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:23,538 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:23,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:23,538 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:23,538 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:23,538 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:23,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:23,539 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 [2018-10-27 15:42:23,547 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:23,547 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:23,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:23,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:23,687 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:23,688 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:24,211 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:24,231 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:24,231 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 15:42:24,231 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:24,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 15:42:24,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 15:42:24,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=677, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 15:42:24,233 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 18 states. [2018-10-27 15:42:24,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:24,290 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-10-27 15:42:24,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 15:42:24,290 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2018-10-27 15:42:24,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:24,291 INFO L225 Difference]: With dead ends: 60 [2018-10-27 15:42:24,291 INFO L226 Difference]: Without dead ends: 55 [2018-10-27 15:42:24,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=451, Invalid=739, Unknown=0, NotChecked=0, Total=1190 [2018-10-27 15:42:24,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-27 15:42:24,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-10-27 15:42:24,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 15:42:24,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-27 15:42:24,299 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-10-27 15:42:24,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:24,299 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-27 15:42:24,299 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 15:42:24,299 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-27 15:42:24,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 15:42:24,300 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:24,300 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:24,300 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:24,301 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:24,301 INFO L82 PathProgramCache]: Analyzing trace with hash 932137213, now seen corresponding path program 14 times [2018-10-27 15:42:24,301 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:24,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:24,302 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:24,302 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:24,302 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:24,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:24,598 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:24,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:24,598 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:24,598 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:24,598 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:24,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:24,599 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 [2018-10-27 15:42:24,607 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:24,607 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:24,646 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 15:42:24,646 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:24,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:24,682 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:24,682 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:25,443 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:25,464 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:25,464 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 15:42:25,465 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:25,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 15:42:25,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 15:42:25,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=754, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 15:42:25,466 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 19 states. [2018-10-27 15:42:25,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:25,547 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 15:42:25,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 15:42:25,547 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 53 [2018-10-27 15:42:25,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:25,548 INFO L225 Difference]: With dead ends: 63 [2018-10-27 15:42:25,549 INFO L226 Difference]: Without dead ends: 58 [2018-10-27 15:42:25,550 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 15:42:25,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-27 15:42:25,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-10-27 15:42:25,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-27 15:42:25,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-10-27 15:42:25,556 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-10-27 15:42:25,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:25,556 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-10-27 15:42:25,556 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 15:42:25,557 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-10-27 15:42:25,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-27 15:42:25,557 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:25,557 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:25,558 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:25,560 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:25,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1319563651, now seen corresponding path program 15 times [2018-10-27 15:42:25,561 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:25,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:25,561 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:25,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:25,562 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:25,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:25,767 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:25,767 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:25,767 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:25,767 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:25,767 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:25,768 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:25,768 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 [2018-10-27 15:42:25,775 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:25,776 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:25,825 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:25,825 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:25,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:25,926 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:25,926 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:27,006 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:27,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:27,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 15:42:27,028 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:27,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 15:42:27,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 15:42:27,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=835, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 15:42:27,029 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 20 states. [2018-10-27 15:42:27,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:27,158 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-10-27 15:42:27,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 15:42:27,159 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 56 [2018-10-27 15:42:27,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:27,160 INFO L225 Difference]: With dead ends: 66 [2018-10-27 15:42:27,160 INFO L226 Difference]: Without dead ends: 61 [2018-10-27 15:42:27,161 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=577, Invalid=905, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 15:42:27,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-10-27 15:42:27,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-10-27 15:42:27,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-27 15:42:27,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-27 15:42:27,165 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-10-27 15:42:27,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:27,166 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-27 15:42:27,166 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 15:42:27,166 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-27 15:42:27,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-27 15:42:27,167 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:27,167 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:27,168 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:27,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:27,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1354193149, now seen corresponding path program 16 times [2018-10-27 15:42:27,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:27,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:27,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:27,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:27,170 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:27,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:27,909 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:27,909 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:27,909 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:27,909 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:27,909 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:27,909 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:27,910 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 [2018-10-27 15:42:27,918 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:27,918 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:27,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:27,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:28,063 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:28,064 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:28,929 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:28,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:28,952 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 15:42:28,952 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:28,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 15:42:28,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 15:42:28,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=920, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 15:42:28,953 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 21 states. [2018-10-27 15:42:29,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:29,000 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-27 15:42:29,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 15:42:29,001 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 59 [2018-10-27 15:42:29,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:29,002 INFO L225 Difference]: With dead ends: 69 [2018-10-27 15:42:29,002 INFO L226 Difference]: Without dead ends: 64 [2018-10-27 15:42:29,003 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 99 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=646, Invalid=994, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 15:42:29,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-27 15:42:29,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-10-27 15:42:29,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-10-27 15:42:29,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-10-27 15:42:29,007 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-10-27 15:42:29,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:29,008 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-10-27 15:42:29,008 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 15:42:29,008 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-10-27 15:42:29,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-10-27 15:42:29,009 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:29,009 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:29,009 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:29,009 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:29,010 INFO L82 PathProgramCache]: Analyzing trace with hash 779550333, now seen corresponding path program 17 times [2018-10-27 15:42:29,010 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:29,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:29,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:29,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:29,011 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:29,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:29,841 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:29,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:29,841 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:29,841 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:29,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:29,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:29,842 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 [2018-10-27 15:42:29,849 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:29,850 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:29,888 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 15:42:29,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:29,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:29,943 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:29,944 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:30,383 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:30,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:30,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 15:42:30,404 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:30,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 15:42:30,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 15:42:30,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=1009, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 15:42:30,405 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 22 states. [2018-10-27 15:42:30,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:30,504 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-10-27 15:42:30,504 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 15:42:30,505 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 62 [2018-10-27 15:42:30,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:30,505 INFO L225 Difference]: With dead ends: 72 [2018-10-27 15:42:30,506 INFO L226 Difference]: Without dead ends: 67 [2018-10-27 15:42:30,506 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=719, Invalid=1087, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 15:42:30,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-27 15:42:30,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-10-27 15:42:30,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-27 15:42:30,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-27 15:42:30,510 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-10-27 15:42:30,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:30,510 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-27 15:42:30,510 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 15:42:30,511 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-27 15:42:30,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 15:42:30,511 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:30,511 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:30,512 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:30,512 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:30,512 INFO L82 PathProgramCache]: Analyzing trace with hash 1335060733, now seen corresponding path program 18 times [2018-10-27 15:42:30,512 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:30,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:30,513 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:30,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:30,513 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:30,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:30,876 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:30,876 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:30,876 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:30,876 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:30,876 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:30,877 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:30,877 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 [2018-10-27 15:42:30,887 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:30,887 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:30,921 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:30,921 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:30,923 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:30,957 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:30,957 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:31,777 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:31,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:31,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 15:42:31,797 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:31,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 15:42:31,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 15:42:31,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=790, Invalid=1102, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 15:42:31,800 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 23 states. [2018-10-27 15:42:31,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:31,859 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-27 15:42:31,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 15:42:31,859 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2018-10-27 15:42:31,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:31,860 INFO L225 Difference]: With dead ends: 75 [2018-10-27 15:42:31,860 INFO L226 Difference]: Without dead ends: 70 [2018-10-27 15:42:31,862 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 109 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=796, Invalid=1184, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 15:42:31,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-27 15:42:31,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2018-10-27 15:42:31,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-27 15:42:31,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2018-10-27 15:42:31,865 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 65 [2018-10-27 15:42:31,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:31,866 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2018-10-27 15:42:31,866 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 15:42:31,866 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2018-10-27 15:42:31,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-10-27 15:42:31,867 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:31,867 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:31,867 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:31,867 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:31,867 INFO L82 PathProgramCache]: Analyzing trace with hash 2036395645, now seen corresponding path program 19 times [2018-10-27 15:42:31,868 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:31,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:31,868 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:31,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:31,869 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:31,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:32,159 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:32,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:32,160 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:32,160 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:32,160 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:32,160 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:32,160 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 [2018-10-27 15:42:32,172 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:32,172 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:32,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:32,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:32,242 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:32,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:32,741 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:32,761 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:32,761 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 15:42:32,761 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:32,762 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 15:42:32,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 15:42:32,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=871, Invalid=1199, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 15:42:32,763 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 24 states. [2018-10-27 15:42:32,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:32,837 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2018-10-27 15:42:32,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 15:42:32,838 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 68 [2018-10-27 15:42:32,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:32,838 INFO L225 Difference]: With dead ends: 78 [2018-10-27 15:42:32,838 INFO L226 Difference]: Without dead ends: 73 [2018-10-27 15:42:32,839 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=877, Invalid=1285, Unknown=0, NotChecked=0, Total=2162 [2018-10-27 15:42:32,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-10-27 15:42:32,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2018-10-27 15:42:32,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-27 15:42:32,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-27 15:42:32,843 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 68 [2018-10-27 15:42:32,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:32,843 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-27 15:42:32,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 15:42:32,843 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-27 15:42:32,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-27 15:42:32,844 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:32,844 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:32,844 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:32,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:32,845 INFO L82 PathProgramCache]: Analyzing trace with hash 488863997, now seen corresponding path program 20 times [2018-10-27 15:42:32,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:32,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:32,846 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:32,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:32,846 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:32,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:33,195 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:33,195 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:33,196 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:33,196 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:33,196 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:33,196 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:33,196 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 [2018-10-27 15:42:33,204 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:33,205 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:33,256 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 15:42:33,256 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:33,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:33,342 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:33,343 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:34,243 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:34,264 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:34,264 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-27 15:42:34,264 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:34,265 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 15:42:34,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 15:42:34,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=1300, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 15:42:34,266 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 25 states. [2018-10-27 15:42:34,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:34,480 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-27 15:42:34,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 15:42:34,484 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 71 [2018-10-27 15:42:34,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:34,485 INFO L225 Difference]: With dead ends: 81 [2018-10-27 15:42:34,485 INFO L226 Difference]: Without dead ends: 76 [2018-10-27 15:42:34,487 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=962, Invalid=1390, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 15:42:34,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-27 15:42:34,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2018-10-27 15:42:34,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-10-27 15:42:34,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2018-10-27 15:42:34,490 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 71 [2018-10-27 15:42:34,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:34,490 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2018-10-27 15:42:34,490 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 15:42:34,490 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2018-10-27 15:42:34,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-27 15:42:34,491 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:34,491 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:34,491 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:34,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:34,491 INFO L82 PathProgramCache]: Analyzing trace with hash 152493693, now seen corresponding path program 21 times [2018-10-27 15:42:34,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:34,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:34,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:34,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:34,492 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:34,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:35,012 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:35,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:35,013 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:35,013 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:35,013 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:35,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:35,013 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 [2018-10-27 15:42:35,021 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:35,021 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:35,065 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:35,065 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:35,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:35,091 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:35,091 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:35,754 INFO L134 CoverageAnalysis]: Checked inductivity of 672 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:35,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:35,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-27 15:42:35,774 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:35,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 15:42:35,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 15:42:35,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=1405, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 15:42:35,776 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 26 states. [2018-10-27 15:42:35,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:35,843 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2018-10-27 15:42:35,844 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 15:42:35,844 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 74 [2018-10-27 15:42:35,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:35,845 INFO L225 Difference]: With dead ends: 84 [2018-10-27 15:42:35,845 INFO L226 Difference]: Without dead ends: 79 [2018-10-27 15:42:35,847 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1051, Invalid=1499, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 15:42:35,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-27 15:42:35,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2018-10-27 15:42:35,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-27 15:42:35,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-10-27 15:42:35,850 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 74 [2018-10-27 15:42:35,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:35,851 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-10-27 15:42:35,851 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 15:42:35,851 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-10-27 15:42:35,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-27 15:42:35,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:35,852 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:35,852 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:35,852 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:35,852 INFO L82 PathProgramCache]: Analyzing trace with hash -496531203, now seen corresponding path program 22 times [2018-10-27 15:42:35,853 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:35,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:35,853 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:35,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:35,854 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:35,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:36,500 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:36,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:36,500 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:36,500 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:36,500 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:36,501 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:36,501 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 [2018-10-27 15:42:36,507 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:36,508 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:36,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:36,553 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:36,593 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:36,593 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:37,247 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:37,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:37,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-27 15:42:37,267 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:37,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 15:42:37,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 15:42:37,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1138, Invalid=1514, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 15:42:37,269 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 27 states. [2018-10-27 15:42:37,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:37,330 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-10-27 15:42:37,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 15:42:37,330 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 77 [2018-10-27 15:42:37,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:37,331 INFO L225 Difference]: With dead ends: 87 [2018-10-27 15:42:37,331 INFO L226 Difference]: Without dead ends: 82 [2018-10-27 15:42:37,333 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1144, Invalid=1612, Unknown=0, NotChecked=0, Total=2756 [2018-10-27 15:42:37,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-10-27 15:42:37,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2018-10-27 15:42:37,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-10-27 15:42:37,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2018-10-27 15:42:37,336 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 77 [2018-10-27 15:42:37,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:37,336 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2018-10-27 15:42:37,336 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 15:42:37,336 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2018-10-27 15:42:37,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-10-27 15:42:37,337 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:37,338 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:37,338 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:37,338 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:37,338 INFO L82 PathProgramCache]: Analyzing trace with hash 345558653, now seen corresponding path program 23 times [2018-10-27 15:42:37,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:37,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:37,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:37,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:37,339 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:37,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:38,136 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:38,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:38,136 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:38,137 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:38,137 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:38,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:38,137 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 [2018-10-27 15:42:38,145 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:38,145 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:38,192 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-27 15:42:38,192 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:38,194 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:38,262 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:38,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:39,569 INFO L134 CoverageAnalysis]: Checked inductivity of 805 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:39,590 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:39,590 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-10-27 15:42:39,590 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:39,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 15:42:39,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 15:42:39,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1235, Invalid=1627, Unknown=0, NotChecked=0, Total=2862 [2018-10-27 15:42:39,592 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 28 states. [2018-10-27 15:42:39,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:39,678 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2018-10-27 15:42:39,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 15:42:39,678 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 80 [2018-10-27 15:42:39,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:39,678 INFO L225 Difference]: With dead ends: 90 [2018-10-27 15:42:39,679 INFO L226 Difference]: Without dead ends: 85 [2018-10-27 15:42:39,680 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1241, Invalid=1729, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 15:42:39,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-27 15:42:39,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2018-10-27 15:42:39,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-10-27 15:42:39,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-10-27 15:42:39,683 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 80 [2018-10-27 15:42:39,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:39,684 INFO L481 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-10-27 15:42:39,684 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 15:42:39,684 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-10-27 15:42:39,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-27 15:42:39,684 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:39,685 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:39,685 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:39,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:39,685 INFO L82 PathProgramCache]: Analyzing trace with hash 140482813, now seen corresponding path program 24 times [2018-10-27 15:42:39,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:39,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:39,686 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:39,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:39,686 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:39,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:40,102 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:40,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:40,102 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:40,102 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:40,103 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:40,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:40,103 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 [2018-10-27 15:42:40,110 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:40,111 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:40,156 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:40,156 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:40,159 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:40,183 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:40,184 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:40,940 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:40,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:40,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-27 15:42:40,961 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:40,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 15:42:40,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 15:42:40,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1336, Invalid=1744, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 15:42:40,963 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 29 states. [2018-10-27 15:42:41,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:41,030 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-10-27 15:42:41,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 15:42:41,031 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 83 [2018-10-27 15:42:41,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:41,032 INFO L225 Difference]: With dead ends: 93 [2018-10-27 15:42:41,032 INFO L226 Difference]: Without dead ends: 88 [2018-10-27 15:42:41,034 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1342, Invalid=1850, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 15:42:41,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-10-27 15:42:41,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2018-10-27 15:42:41,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-27 15:42:41,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2018-10-27 15:42:41,037 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 83 [2018-10-27 15:42:41,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:41,037 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2018-10-27 15:42:41,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 15:42:41,037 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2018-10-27 15:42:41,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-27 15:42:41,038 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:41,038 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:41,038 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:41,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:41,038 INFO L82 PathProgramCache]: Analyzing trace with hash -1830371715, now seen corresponding path program 25 times [2018-10-27 15:42:41,038 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:41,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:41,039 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:41,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:41,039 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:41,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:41,641 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:41,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:41,641 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:41,641 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:41,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:41,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:41,642 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 [2018-10-27 15:42:41,649 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:41,649 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:41,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:41,695 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:41,746 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:41,746 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:42,596 INFO L134 CoverageAnalysis]: Checked inductivity of 950 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:42,616 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:42,617 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-27 15:42:42,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:42,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 15:42:42,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 15:42:42,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1441, Invalid=1865, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 15:42:42,618 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 30 states. [2018-10-27 15:42:42,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:42,721 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2018-10-27 15:42:42,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 15:42:42,724 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 86 [2018-10-27 15:42:42,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:42,725 INFO L225 Difference]: With dead ends: 96 [2018-10-27 15:42:42,725 INFO L226 Difference]: Without dead ends: 91 [2018-10-27 15:42:42,726 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1447, Invalid=1975, Unknown=0, NotChecked=0, Total=3422 [2018-10-27 15:42:42,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-27 15:42:42,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2018-10-27 15:42:42,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-27 15:42:42,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-10-27 15:42:42,729 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 86 [2018-10-27 15:42:42,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:42,729 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-10-27 15:42:42,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 15:42:42,729 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-10-27 15:42:42,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-27 15:42:42,730 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:42,730 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:42,730 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:42,731 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:42,731 INFO L82 PathProgramCache]: Analyzing trace with hash 940288253, now seen corresponding path program 26 times [2018-10-27 15:42:42,731 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:42,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:42,732 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:42,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:42,732 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:42,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:43,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:43,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:43,319 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:43,319 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:43,320 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:43,320 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:43,320 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 [2018-10-27 15:42:43,328 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:43,328 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:43,381 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-27 15:42:43,381 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:43,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:43,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:43,453 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:44,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:44,616 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:44,616 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-10-27 15:42:44,617 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:44,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 15:42:44,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 15:42:44,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1550, Invalid=1990, Unknown=0, NotChecked=0, Total=3540 [2018-10-27 15:42:44,618 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 31 states. [2018-10-27 15:42:44,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:44,683 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-10-27 15:42:44,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 15:42:44,684 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 89 [2018-10-27 15:42:44,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:44,684 INFO L225 Difference]: With dead ends: 99 [2018-10-27 15:42:44,684 INFO L226 Difference]: Without dead ends: 94 [2018-10-27 15:42:44,685 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1556, Invalid=2104, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 15:42:44,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-10-27 15:42:44,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2018-10-27 15:42:44,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-10-27 15:42:44,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2018-10-27 15:42:44,689 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 89 [2018-10-27 15:42:44,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:44,689 INFO L481 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2018-10-27 15:42:44,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 15:42:44,689 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2018-10-27 15:42:44,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-10-27 15:42:44,689 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:44,690 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:44,690 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:44,690 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:44,690 INFO L82 PathProgramCache]: Analyzing trace with hash 989900413, now seen corresponding path program 27 times [2018-10-27 15:42:44,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:44,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:44,691 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:44,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:44,691 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:44,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:45,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:45,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:45,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:45,962 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:45,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:45,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:45,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 15:42:45,972 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:45,972 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:46,017 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:46,017 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:46,019 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:46,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:46,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:47,471 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:47,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:47,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-27 15:42:47,491 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:47,492 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 15:42:47,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 15:42:47,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1663, Invalid=2119, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 15:42:47,493 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 32 states. [2018-10-27 15:42:47,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:47,624 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2018-10-27 15:42:47,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 15:42:47,625 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 92 [2018-10-27 15:42:47,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:47,626 INFO L225 Difference]: With dead ends: 102 [2018-10-27 15:42:47,626 INFO L226 Difference]: Without dead ends: 97 [2018-10-27 15:42:47,627 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 154 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1669, Invalid=2237, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 15:42:47,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-27 15:42:47,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2018-10-27 15:42:47,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-10-27 15:42:47,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-10-27 15:42:47,631 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 92 [2018-10-27 15:42:47,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:47,631 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-10-27 15:42:47,632 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 15:42:47,632 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-10-27 15:42:47,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-27 15:42:47,632 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:47,632 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:47,633 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:47,633 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:47,633 INFO L82 PathProgramCache]: Analyzing trace with hash 1517009149, now seen corresponding path program 28 times [2018-10-27 15:42:47,633 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:47,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:47,634 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:47,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:47,634 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:47,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:48,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:48,136 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:48,137 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:48,137 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:48,137 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:48,137 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:48,137 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 [2018-10-27 15:42:48,145 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:48,146 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:48,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:48,191 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:48,224 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:48,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:49,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:49,224 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:49,225 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-10-27 15:42:49,225 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:49,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 15:42:49,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 15:42:49,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1780, Invalid=2252, Unknown=0, NotChecked=0, Total=4032 [2018-10-27 15:42:49,226 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 33 states. [2018-10-27 15:42:49,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:49,324 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-10-27 15:42:49,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 15:42:49,328 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 95 [2018-10-27 15:42:49,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:49,329 INFO L225 Difference]: With dead ends: 105 [2018-10-27 15:42:49,329 INFO L226 Difference]: Without dead ends: 100 [2018-10-27 15:42:49,330 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 159 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1786, Invalid=2374, Unknown=0, NotChecked=0, Total=4160 [2018-10-27 15:42:49,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-27 15:42:49,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2018-10-27 15:42:49,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-27 15:42:49,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2018-10-27 15:42:49,335 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 95 [2018-10-27 15:42:49,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:49,336 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2018-10-27 15:42:49,336 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 15:42:49,336 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2018-10-27 15:42:49,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-10-27 15:42:49,337 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:49,337 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:49,337 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:49,337 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:49,337 INFO L82 PathProgramCache]: Analyzing trace with hash -2082038147, now seen corresponding path program 29 times [2018-10-27 15:42:49,337 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:49,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:49,338 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:49,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:49,338 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:49,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:49,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:49,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:49,893 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:49,893 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:49,893 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:49,894 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:49,894 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 [2018-10-27 15:42:49,902 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:49,902 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:49,966 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-27 15:42:49,966 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:49,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:50,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:50,035 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:51,286 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:51,307 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:51,307 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-10-27 15:42:51,307 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:51,308 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 15:42:51,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 15:42:51,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1901, Invalid=2389, Unknown=0, NotChecked=0, Total=4290 [2018-10-27 15:42:51,309 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 34 states. [2018-10-27 15:42:51,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:51,398 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2018-10-27 15:42:51,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 15:42:51,398 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 98 [2018-10-27 15:42:51,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:51,399 INFO L225 Difference]: With dead ends: 108 [2018-10-27 15:42:51,399 INFO L226 Difference]: Without dead ends: 103 [2018-10-27 15:42:51,401 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1907, Invalid=2515, Unknown=0, NotChecked=0, Total=4422 [2018-10-27 15:42:51,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-10-27 15:42:51,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-10-27 15:42:51,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-27 15:42:51,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-10-27 15:42:51,404 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 98 [2018-10-27 15:42:51,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:51,404 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-10-27 15:42:51,404 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 15:42:51,404 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-10-27 15:42:51,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-27 15:42:51,405 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:51,405 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:51,405 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:51,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:51,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1736455939, now seen corresponding path program 30 times [2018-10-27 15:42:51,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:51,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:51,406 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:51,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:51,407 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:51,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:52,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:52,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:52,094 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:52,094 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:52,094 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:52,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:52,094 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 [2018-10-27 15:42:52,101 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:52,102 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:52,152 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:52,152 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:52,155 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:52,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:52,208 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:53,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1365 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:53,403 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:53,403 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 68 [2018-10-27 15:42:53,403 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:53,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 15:42:53,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 15:42:53,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2026, Invalid=2530, Unknown=0, NotChecked=0, Total=4556 [2018-10-27 15:42:53,404 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 35 states. [2018-10-27 15:42:53,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:53,514 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-10-27 15:42:53,515 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-27 15:42:53,515 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 101 [2018-10-27 15:42:53,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:53,515 INFO L225 Difference]: With dead ends: 111 [2018-10-27 15:42:53,516 INFO L226 Difference]: Without dead ends: 106 [2018-10-27 15:42:53,516 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 169 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2018-10-27 15:42:53,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-10-27 15:42:53,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-10-27 15:42:53,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-10-27 15:42:53,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2018-10-27 15:42:53,520 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 101 [2018-10-27 15:42:53,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:53,521 INFO L481 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2018-10-27 15:42:53,521 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 15:42:53,521 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2018-10-27 15:42:53,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-27 15:42:53,522 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:53,522 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:53,522 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:53,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:53,522 INFO L82 PathProgramCache]: Analyzing trace with hash -1533505923, now seen corresponding path program 31 times [2018-10-27 15:42:53,522 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:53,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:53,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:53,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:53,523 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:53,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:54,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:54,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:54,024 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:54,024 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:54,025 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:54,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:54,025 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 [2018-10-27 15:42:54,034 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:54,034 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:42:54,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:54,086 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:54,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:54,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:55,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:55,582 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:55,582 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 70 [2018-10-27 15:42:55,582 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:55,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-27 15:42:55,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-27 15:42:55,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2155, Invalid=2675, Unknown=0, NotChecked=0, Total=4830 [2018-10-27 15:42:55,584 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 36 states. [2018-10-27 15:42:55,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:55,709 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2018-10-27 15:42:55,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-27 15:42:55,709 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 104 [2018-10-27 15:42:55,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:55,710 INFO L225 Difference]: With dead ends: 114 [2018-10-27 15:42:55,710 INFO L226 Difference]: Without dead ends: 109 [2018-10-27 15:42:55,711 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2161, Invalid=2809, Unknown=0, NotChecked=0, Total=4970 [2018-10-27 15:42:55,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-27 15:42:55,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2018-10-27 15:42:55,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-10-27 15:42:55,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-10-27 15:42:55,714 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 104 [2018-10-27 15:42:55,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:55,715 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-10-27 15:42:55,715 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-27 15:42:55,715 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-10-27 15:42:55,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-27 15:42:55,716 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:55,716 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:55,716 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:55,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:55,716 INFO L82 PathProgramCache]: Analyzing trace with hash 1531435261, now seen corresponding path program 32 times [2018-10-27 15:42:55,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:55,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:55,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:42:55,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:55,717 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:55,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:56,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:56,449 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:56,450 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:56,450 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:56,450 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:56,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:56,450 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 [2018-10-27 15:42:56,458 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:42:56,458 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:42:56,526 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-27 15:42:56,526 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:56,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:56,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:56,672 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:42:58,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1552 backedges. 0 proven. 1552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:58,068 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:42:58,069 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 72 [2018-10-27 15:42:58,069 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:42:58,069 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-27 15:42:58,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-27 15:42:58,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2288, Invalid=2824, Unknown=0, NotChecked=0, Total=5112 [2018-10-27 15:42:58,070 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 37 states. [2018-10-27 15:42:58,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:42:58,146 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-10-27 15:42:58,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-27 15:42:58,147 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 107 [2018-10-27 15:42:58,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:42:58,148 INFO L225 Difference]: With dead ends: 117 [2018-10-27 15:42:58,148 INFO L226 Difference]: Without dead ends: 112 [2018-10-27 15:42:58,149 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 179 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2294, Invalid=2962, Unknown=0, NotChecked=0, Total=5256 [2018-10-27 15:42:58,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-27 15:42:58,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2018-10-27 15:42:58,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-10-27 15:42:58,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2018-10-27 15:42:58,153 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 107 [2018-10-27 15:42:58,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:42:58,153 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2018-10-27 15:42:58,153 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-27 15:42:58,153 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2018-10-27 15:42:58,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-10-27 15:42:58,154 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:42:58,154 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:42:58,154 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:42:58,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:42:58,155 INFO L82 PathProgramCache]: Analyzing trace with hash -1810465155, now seen corresponding path program 33 times [2018-10-27 15:42:58,155 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:42:58,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:58,155 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:42:58,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:42:58,156 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:42:58,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:42:58,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:58,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:58,905 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:42:58,905 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:42:58,905 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:42:58,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:42:58,905 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 [2018-10-27 15:42:58,913 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:42:58,913 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:42:58,965 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:42:58,966 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:42:58,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:42:59,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:42:59,024 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:00,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 0 proven. 1650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:00,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:00,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 74 [2018-10-27 15:43:00,410 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:00,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-27 15:43:00,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-27 15:43:00,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-10-27 15:43:00,411 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 38 states. [2018-10-27 15:43:00,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:00,490 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2018-10-27 15:43:00,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-27 15:43:00,490 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 110 [2018-10-27 15:43:00,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:00,491 INFO L225 Difference]: With dead ends: 120 [2018-10-27 15:43:00,491 INFO L226 Difference]: Without dead ends: 115 [2018-10-27 15:43:00,491 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 184 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2431, Invalid=3119, Unknown=0, NotChecked=0, Total=5550 [2018-10-27 15:43:00,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-27 15:43:00,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-10-27 15:43:00,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-10-27 15:43:00,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-10-27 15:43:00,495 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 110 [2018-10-27 15:43:00,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:00,496 INFO L481 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-10-27 15:43:00,496 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-27 15:43:00,496 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-10-27 15:43:00,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-10-27 15:43:00,497 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:00,497 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:00,497 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:00,497 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:00,497 INFO L82 PathProgramCache]: Analyzing trace with hash 1271130365, now seen corresponding path program 34 times [2018-10-27 15:43:00,498 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:00,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:00,498 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:00,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:00,498 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:00,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:01,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:01,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:01,931 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:01,931 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:01,931 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:01,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:01,931 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 [2018-10-27 15:43:01,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:01,938 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:43:01,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:01,995 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:02,077 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:02,078 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:03,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1751 backedges. 0 proven. 1751 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:03,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:03,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 76 [2018-10-27 15:43:03,471 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:03,471 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 15:43:03,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 15:43:03,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2566, Invalid=3134, Unknown=0, NotChecked=0, Total=5700 [2018-10-27 15:43:03,472 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 39 states. [2018-10-27 15:43:03,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:03,718 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-10-27 15:43:03,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-27 15:43:03,718 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 113 [2018-10-27 15:43:03,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:03,719 INFO L225 Difference]: With dead ends: 123 [2018-10-27 15:43:03,720 INFO L226 Difference]: Without dead ends: 118 [2018-10-27 15:43:03,720 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2572, Invalid=3280, Unknown=0, NotChecked=0, Total=5852 [2018-10-27 15:43:03,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-10-27 15:43:03,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2018-10-27 15:43:03,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-27 15:43:03,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2018-10-27 15:43:03,724 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 113 [2018-10-27 15:43:03,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:03,724 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2018-10-27 15:43:03,725 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 15:43:03,725 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2018-10-27 15:43:03,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-27 15:43:03,725 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:03,725 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:03,725 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:03,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:03,726 INFO L82 PathProgramCache]: Analyzing trace with hash 157314685, now seen corresponding path program 35 times [2018-10-27 15:43:03,726 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:03,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:03,726 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:03,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:03,727 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:03,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:04,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:04,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:04,370 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:04,370 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:04,370 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:04,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:04,370 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 [2018-10-27 15:43:04,377 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:43:04,378 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:43:04,454 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-27 15:43:04,454 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:04,458 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:04,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:04,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:06,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1855 backedges. 0 proven. 1855 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:06,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:06,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 78 [2018-10-27 15:43:06,361 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:06,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-27 15:43:06,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-27 15:43:06,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2711, Invalid=3295, Unknown=0, NotChecked=0, Total=6006 [2018-10-27 15:43:06,362 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 40 states. [2018-10-27 15:43:06,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:06,449 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2018-10-27 15:43:06,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-27 15:43:06,449 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 116 [2018-10-27 15:43:06,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:06,450 INFO L225 Difference]: With dead ends: 126 [2018-10-27 15:43:06,451 INFO L226 Difference]: Without dead ends: 121 [2018-10-27 15:43:06,451 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 194 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2717, Invalid=3445, Unknown=0, NotChecked=0, Total=6162 [2018-10-27 15:43:06,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-10-27 15:43:06,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-10-27 15:43:06,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-27 15:43:06,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-10-27 15:43:06,455 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 116 [2018-10-27 15:43:06,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:06,455 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-10-27 15:43:06,455 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-27 15:43:06,455 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-10-27 15:43:06,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-27 15:43:06,456 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:06,456 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:06,457 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:06,457 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:06,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1391720701, now seen corresponding path program 36 times [2018-10-27 15:43:06,457 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:06,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:06,458 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:06,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:06,458 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:06,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:07,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:07,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:07,288 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:07,288 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:07,288 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:07,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:07,289 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 [2018-10-27 15:43:07,295 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:43:07,296 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:43:07,352 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:43:07,352 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:07,355 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:07,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:07,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:09,304 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 1962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:09,324 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:09,325 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 80 [2018-10-27 15:43:09,325 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:09,325 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-27 15:43:09,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-27 15:43:09,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2860, Invalid=3460, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 15:43:09,326 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 41 states. [2018-10-27 15:43:09,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:09,415 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-10-27 15:43:09,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-27 15:43:09,416 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 119 [2018-10-27 15:43:09,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:09,417 INFO L225 Difference]: With dead ends: 129 [2018-10-27 15:43:09,417 INFO L226 Difference]: Without dead ends: 124 [2018-10-27 15:43:09,418 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 291 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2866, Invalid=3614, Unknown=0, NotChecked=0, Total=6480 [2018-10-27 15:43:09,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-10-27 15:43:09,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2018-10-27 15:43:09,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-10-27 15:43:09,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2018-10-27 15:43:09,421 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 119 [2018-10-27 15:43:09,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:09,421 INFO L481 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2018-10-27 15:43:09,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-27 15:43:09,422 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2018-10-27 15:43:09,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-10-27 15:43:09,422 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:09,422 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:09,422 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:09,423 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:09,423 INFO L82 PathProgramCache]: Analyzing trace with hash 2071355005, now seen corresponding path program 37 times [2018-10-27 15:43:09,423 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:09,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:09,424 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:09,424 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:09,424 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:09,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:10,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:10,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:10,163 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:10,163 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:10,164 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:10,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:10,164 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 [2018-10-27 15:43:10,171 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:10,171 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:43:10,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:10,235 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:10,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:10,336 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:11,983 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 0 proven. 2072 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:12,003 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:12,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 82 [2018-10-27 15:43:12,004 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:12,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-27 15:43:12,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-27 15:43:12,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3013, Invalid=3629, Unknown=0, NotChecked=0, Total=6642 [2018-10-27 15:43:12,005 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 42 states. [2018-10-27 15:43:12,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:12,120 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2018-10-27 15:43:12,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-27 15:43:12,122 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 122 [2018-10-27 15:43:12,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:12,123 INFO L225 Difference]: With dead ends: 132 [2018-10-27 15:43:12,123 INFO L226 Difference]: Without dead ends: 127 [2018-10-27 15:43:12,124 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 204 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3019, Invalid=3787, Unknown=0, NotChecked=0, Total=6806 [2018-10-27 15:43:12,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-27 15:43:12,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2018-10-27 15:43:12,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-10-27 15:43:12,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-10-27 15:43:12,128 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 122 [2018-10-27 15:43:12,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:12,129 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-10-27 15:43:12,129 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-27 15:43:12,129 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-10-27 15:43:12,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-27 15:43:12,129 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:12,130 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:12,130 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:12,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:12,130 INFO L82 PathProgramCache]: Analyzing trace with hash -1713895171, now seen corresponding path program 38 times [2018-10-27 15:43:12,130 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:12,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:12,131 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:12,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:12,131 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:12,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:13,680 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:13,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:13,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:13,681 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:13,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:13,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:13,681 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 [2018-10-27 15:43:13,688 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:43:13,688 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:43:13,770 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-27 15:43:13,770 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:13,773 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:14,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:14,335 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:16,473 INFO L134 CoverageAnalysis]: Checked inductivity of 2185 backedges. 0 proven. 2185 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:16,493 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:16,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 84 [2018-10-27 15:43:16,494 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:16,494 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 15:43:16,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 15:43:16,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3170, Invalid=3802, Unknown=0, NotChecked=0, Total=6972 [2018-10-27 15:43:16,495 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 43 states. [2018-10-27 15:43:16,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:16,707 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-10-27 15:43:16,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-27 15:43:16,707 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 125 [2018-10-27 15:43:16,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:16,708 INFO L225 Difference]: With dead ends: 135 [2018-10-27 15:43:16,709 INFO L226 Difference]: Without dead ends: 130 [2018-10-27 15:43:16,709 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 209 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3176, Invalid=3964, Unknown=0, NotChecked=0, Total=7140 [2018-10-27 15:43:16,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-10-27 15:43:16,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2018-10-27 15:43:16,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-27 15:43:16,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2018-10-27 15:43:16,713 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 125 [2018-10-27 15:43:16,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:16,713 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2018-10-27 15:43:16,713 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 15:43:16,714 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2018-10-27 15:43:16,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-10-27 15:43:16,714 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:16,714 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:16,715 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:16,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:16,715 INFO L82 PathProgramCache]: Analyzing trace with hash 559435389, now seen corresponding path program 39 times [2018-10-27 15:43:16,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:16,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:16,716 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:16,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:16,716 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:16,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:17,448 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:17,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:17,448 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:17,448 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:17,448 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:17,448 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:17,449 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 15:43:17,456 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:43:17,456 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:43:17,530 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:43:17,531 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:17,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:17,612 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:17,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:19,363 INFO L134 CoverageAnalysis]: Checked inductivity of 2301 backedges. 0 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:19,394 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:19,394 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 86 [2018-10-27 15:43:19,394 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:19,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-27 15:43:19,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-27 15:43:19,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3331, Invalid=3979, Unknown=0, NotChecked=0, Total=7310 [2018-10-27 15:43:19,396 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 44 states. [2018-10-27 15:43:19,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:19,591 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2018-10-27 15:43:19,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-27 15:43:19,592 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 128 [2018-10-27 15:43:19,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:19,592 INFO L225 Difference]: With dead ends: 138 [2018-10-27 15:43:19,592 INFO L226 Difference]: Without dead ends: 133 [2018-10-27 15:43:19,593 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 214 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=3337, Invalid=4145, Unknown=0, NotChecked=0, Total=7482 [2018-10-27 15:43:19,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-10-27 15:43:19,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2018-10-27 15:43:19,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-27 15:43:19,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-10-27 15:43:19,597 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 128 [2018-10-27 15:43:19,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:19,598 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-10-27 15:43:19,598 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-27 15:43:19,598 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-10-27 15:43:19,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-10-27 15:43:19,598 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:19,599 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:19,599 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:19,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:19,599 INFO L82 PathProgramCache]: Analyzing trace with hash -1989142275, now seen corresponding path program 40 times [2018-10-27 15:43:19,599 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:19,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:19,600 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:19,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:19,600 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:19,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:21,700 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:21,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:21,700 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:21,700 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:21,701 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:21,701 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:21,701 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 [2018-10-27 15:43:21,709 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:21,709 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:43:21,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:21,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:21,833 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:21,833 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:23,734 INFO L134 CoverageAnalysis]: Checked inductivity of 2420 backedges. 0 proven. 2420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:23,763 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:23,764 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 88 [2018-10-27 15:43:23,764 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:23,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-27 15:43:23,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-27 15:43:23,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3496, Invalid=4160, Unknown=0, NotChecked=0, Total=7656 [2018-10-27 15:43:23,765 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 45 states. [2018-10-27 15:43:23,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:23,900 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-10-27 15:43:23,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-27 15:43:23,901 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 131 [2018-10-27 15:43:23,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:23,902 INFO L225 Difference]: With dead ends: 141 [2018-10-27 15:43:23,903 INFO L226 Difference]: Without dead ends: 136 [2018-10-27 15:43:23,903 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 219 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3502, Invalid=4330, Unknown=0, NotChecked=0, Total=7832 [2018-10-27 15:43:23,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-10-27 15:43:23,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2018-10-27 15:43:23,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-10-27 15:43:23,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 135 transitions. [2018-10-27 15:43:23,907 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 135 transitions. Word has length 131 [2018-10-27 15:43:23,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:23,907 INFO L481 AbstractCegarLoop]: Abstraction has 135 states and 135 transitions. [2018-10-27 15:43:23,907 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-27 15:43:23,908 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 135 transitions. [2018-10-27 15:43:23,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-27 15:43:23,908 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:23,908 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:23,909 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:23,909 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:23,909 INFO L82 PathProgramCache]: Analyzing trace with hash -234471811, now seen corresponding path program 41 times [2018-10-27 15:43:23,909 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:23,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:23,910 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:23,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:23,910 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:23,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:25,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:25,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:25,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:25,431 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:25,431 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:25,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:25,431 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 [2018-10-27 15:43:25,439 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:43:25,439 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:43:25,611 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-27 15:43:25,611 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:25,615 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:25,752 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:25,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:27,706 INFO L134 CoverageAnalysis]: Checked inductivity of 2542 backedges. 0 proven. 2542 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:27,727 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:27,727 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 90 [2018-10-27 15:43:27,727 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:27,727 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-27 15:43:27,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-27 15:43:27,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3665, Invalid=4345, Unknown=0, NotChecked=0, Total=8010 [2018-10-27 15:43:27,729 INFO L87 Difference]: Start difference. First operand 135 states and 135 transitions. Second operand 46 states. [2018-10-27 15:43:28,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:28,079 INFO L93 Difference]: Finished difference Result 144 states and 144 transitions. [2018-10-27 15:43:28,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-27 15:43:28,079 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 134 [2018-10-27 15:43:28,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:28,080 INFO L225 Difference]: With dead ends: 144 [2018-10-27 15:43:28,080 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 15:43:28,080 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 224 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3671, Invalid=4519, Unknown=0, NotChecked=0, Total=8190 [2018-10-27 15:43:28,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 15:43:28,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2018-10-27 15:43:28,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-10-27 15:43:28,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-10-27 15:43:28,084 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 134 [2018-10-27 15:43:28,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:28,085 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-10-27 15:43:28,085 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-27 15:43:28,085 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-10-27 15:43:28,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-27 15:43:28,086 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:28,086 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:28,086 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:28,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:28,087 INFO L82 PathProgramCache]: Analyzing trace with hash -893638403, now seen corresponding path program 42 times [2018-10-27 15:43:28,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:28,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:28,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:28,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:28,088 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:28,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:29,376 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:29,376 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:29,376 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:29,376 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:29,376 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:29,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:29,377 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 15:43:29,384 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:43:29,384 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:43:29,448 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:43:29,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:29,451 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:29,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:29,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:31,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 2667 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:31,863 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:31,863 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 92 [2018-10-27 15:43:31,863 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:31,863 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 15:43:31,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 15:43:31,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3838, Invalid=4534, Unknown=0, NotChecked=0, Total=8372 [2018-10-27 15:43:31,864 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 47 states. [2018-10-27 15:43:31,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:31,979 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-10-27 15:43:31,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-27 15:43:31,979 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 137 [2018-10-27 15:43:31,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:31,981 INFO L225 Difference]: With dead ends: 147 [2018-10-27 15:43:31,981 INFO L226 Difference]: Without dead ends: 142 [2018-10-27 15:43:31,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 229 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 339 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3844, Invalid=4712, Unknown=0, NotChecked=0, Total=8556 [2018-10-27 15:43:31,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-10-27 15:43:31,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2018-10-27 15:43:31,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-10-27 15:43:31,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 141 transitions. [2018-10-27 15:43:31,985 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 141 transitions. Word has length 137 [2018-10-27 15:43:31,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:31,986 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 141 transitions. [2018-10-27 15:43:31,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-27 15:43:31,986 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 141 transitions. [2018-10-27 15:43:31,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-10-27 15:43:31,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:31,987 INFO L375 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:31,987 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:31,987 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:31,987 INFO L82 PathProgramCache]: Analyzing trace with hash -1535103363, now seen corresponding path program 43 times [2018-10-27 15:43:31,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:31,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:31,988 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:31,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:31,988 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:32,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:32,819 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:32,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:32,820 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:32,820 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:32,820 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:32,820 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:32,820 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 [2018-10-27 15:43:32,828 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:32,828 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:43:32,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:32,897 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:32,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:32,965 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:35,110 INFO L134 CoverageAnalysis]: Checked inductivity of 2795 backedges. 0 proven. 2795 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:35,132 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:35,132 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 94 [2018-10-27 15:43:35,132 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:35,133 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-27 15:43:35,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-27 15:43:35,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4015, Invalid=4727, Unknown=0, NotChecked=0, Total=8742 [2018-10-27 15:43:35,134 INFO L87 Difference]: Start difference. First operand 141 states and 141 transitions. Second operand 48 states. [2018-10-27 15:43:35,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:35,247 INFO L93 Difference]: Finished difference Result 150 states and 150 transitions. [2018-10-27 15:43:35,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-27 15:43:35,247 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 140 [2018-10-27 15:43:35,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:35,249 INFO L225 Difference]: With dead ends: 150 [2018-10-27 15:43:35,249 INFO L226 Difference]: Without dead ends: 145 [2018-10-27 15:43:35,250 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 234 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=4021, Invalid=4909, Unknown=0, NotChecked=0, Total=8930 [2018-10-27 15:43:35,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-27 15:43:35,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 144. [2018-10-27 15:43:35,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-10-27 15:43:35,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-10-27 15:43:35,253 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 140 [2018-10-27 15:43:35,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:35,254 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-10-27 15:43:35,254 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-27 15:43:35,254 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-10-27 15:43:35,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-10-27 15:43:35,255 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:35,255 INFO L375 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:35,255 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:35,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:35,255 INFO L82 PathProgramCache]: Analyzing trace with hash 1186740477, now seen corresponding path program 44 times [2018-10-27 15:43:35,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:35,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:35,256 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:35,256 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:35,256 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:35,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:36,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:36,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:36,123 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:36,123 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:36,123 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:36,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:36,123 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 [2018-10-27 15:43:36,131 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:43:36,131 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:43:36,224 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-10-27 15:43:36,225 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:36,227 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:36,284 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:36,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:38,500 INFO L134 CoverageAnalysis]: Checked inductivity of 2926 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:38,520 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:38,520 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 96 [2018-10-27 15:43:38,521 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:38,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-27 15:43:38,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-27 15:43:38,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4196, Invalid=4924, Unknown=0, NotChecked=0, Total=9120 [2018-10-27 15:43:38,522 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 49 states. [2018-10-27 15:43:38,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:38,608 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-10-27 15:43:38,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-27 15:43:38,608 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 143 [2018-10-27 15:43:38,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:38,609 INFO L225 Difference]: With dead ends: 153 [2018-10-27 15:43:38,610 INFO L226 Difference]: Without dead ends: 148 [2018-10-27 15:43:38,611 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 239 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=4202, Invalid=5110, Unknown=0, NotChecked=0, Total=9312 [2018-10-27 15:43:38,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-27 15:43:38,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2018-10-27 15:43:38,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-27 15:43:38,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 147 transitions. [2018-10-27 15:43:38,614 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 147 transitions. Word has length 143 [2018-10-27 15:43:38,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:38,615 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 147 transitions. [2018-10-27 15:43:38,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-27 15:43:38,615 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 147 transitions. [2018-10-27 15:43:38,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-27 15:43:38,616 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:38,616 INFO L375 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:38,616 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:38,616 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:38,616 INFO L82 PathProgramCache]: Analyzing trace with hash -1345970563, now seen corresponding path program 45 times [2018-10-27 15:43:38,616 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:38,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:38,617 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:38,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:38,617 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:38,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:39,499 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:39,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:39,500 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:39,500 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:39,500 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:39,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:39,500 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 [2018-10-27 15:43:39,508 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:43:39,508 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:43:39,580 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:43:39,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:39,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:40,162 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:40,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:42,501 INFO L134 CoverageAnalysis]: Checked inductivity of 3060 backedges. 0 proven. 3060 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:42,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:42,522 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 98 [2018-10-27 15:43:42,522 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:42,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-27 15:43:42,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-27 15:43:42,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4381, Invalid=5125, Unknown=0, NotChecked=0, Total=9506 [2018-10-27 15:43:42,524 INFO L87 Difference]: Start difference. First operand 147 states and 147 transitions. Second operand 50 states. [2018-10-27 15:43:42,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:42,614 INFO L93 Difference]: Finished difference Result 156 states and 156 transitions. [2018-10-27 15:43:42,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-10-27 15:43:42,614 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 146 [2018-10-27 15:43:42,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:42,616 INFO L225 Difference]: With dead ends: 156 [2018-10-27 15:43:42,616 INFO L226 Difference]: Without dead ends: 151 [2018-10-27 15:43:42,617 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 244 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 363 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4387, Invalid=5315, Unknown=0, NotChecked=0, Total=9702 [2018-10-27 15:43:42,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-10-27 15:43:42,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2018-10-27 15:43:42,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-27 15:43:42,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-10-27 15:43:42,620 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 146 [2018-10-27 15:43:42,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:42,620 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-10-27 15:43:42,620 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-27 15:43:42,620 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-10-27 15:43:42,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-27 15:43:42,621 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:42,621 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:42,621 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:42,622 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:42,622 INFO L82 PathProgramCache]: Analyzing trace with hash 644892925, now seen corresponding path program 46 times [2018-10-27 15:43:42,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:42,622 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:42,622 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:42,623 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:42,623 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:42,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:43,582 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:43,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:43,582 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:43,583 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:43,583 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:43,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:43,583 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 [2018-10-27 15:43:43,593 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:43,593 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:43:43,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:43,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:43,787 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:43,787 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:46,404 INFO L134 CoverageAnalysis]: Checked inductivity of 3197 backedges. 0 proven. 3197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:46,423 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:46,424 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 100 [2018-10-27 15:43:46,424 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:46,424 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-27 15:43:46,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-27 15:43:46,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4570, Invalid=5330, Unknown=0, NotChecked=0, Total=9900 [2018-10-27 15:43:46,425 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 51 states. [2018-10-27 15:43:46,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:46,545 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-10-27 15:43:46,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-27 15:43:46,545 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 149 [2018-10-27 15:43:46,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:46,546 INFO L225 Difference]: With dead ends: 159 [2018-10-27 15:43:46,546 INFO L226 Difference]: Without dead ends: 154 [2018-10-27 15:43:46,547 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 249 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 371 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4576, Invalid=5524, Unknown=0, NotChecked=0, Total=10100 [2018-10-27 15:43:46,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-10-27 15:43:46,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2018-10-27 15:43:46,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-10-27 15:43:46,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 153 transitions. [2018-10-27 15:43:46,551 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 153 transitions. Word has length 149 [2018-10-27 15:43:46,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:46,552 INFO L481 AbstractCegarLoop]: Abstraction has 153 states and 153 transitions. [2018-10-27 15:43:46,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-27 15:43:46,552 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 153 transitions. [2018-10-27 15:43:46,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-10-27 15:43:46,553 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:46,553 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:46,553 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:46,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:46,553 INFO L82 PathProgramCache]: Analyzing trace with hash 1255673469, now seen corresponding path program 47 times [2018-10-27 15:43:46,553 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:46,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:46,554 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:46,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:46,554 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:46,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:47,558 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:47,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:47,558 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:47,558 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:47,558 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:47,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:47,559 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 [2018-10-27 15:43:47,566 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:43:47,566 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:43:47,668 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-10-27 15:43:47,668 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:47,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:47,733 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:47,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:50,234 INFO L134 CoverageAnalysis]: Checked inductivity of 3337 backedges. 0 proven. 3337 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:50,255 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:50,255 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 102 [2018-10-27 15:43:50,255 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:50,255 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-10-27 15:43:50,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-10-27 15:43:50,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4763, Invalid=5539, Unknown=0, NotChecked=0, Total=10302 [2018-10-27 15:43:50,256 INFO L87 Difference]: Start difference. First operand 153 states and 153 transitions. Second operand 52 states. [2018-10-27 15:43:50,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:50,378 INFO L93 Difference]: Finished difference Result 162 states and 162 transitions. [2018-10-27 15:43:50,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-10-27 15:43:50,379 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 152 [2018-10-27 15:43:50,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:50,380 INFO L225 Difference]: With dead ends: 162 [2018-10-27 15:43:50,380 INFO L226 Difference]: Without dead ends: 157 [2018-10-27 15:43:50,381 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 254 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4769, Invalid=5737, Unknown=0, NotChecked=0, Total=10506 [2018-10-27 15:43:50,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-27 15:43:50,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 156. [2018-10-27 15:43:50,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-10-27 15:43:50,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-10-27 15:43:50,385 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 152 [2018-10-27 15:43:50,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:50,386 INFO L481 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-10-27 15:43:50,386 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-10-27 15:43:50,386 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-10-27 15:43:50,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-27 15:43:50,387 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:50,387 INFO L375 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:50,387 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:50,387 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:50,387 INFO L82 PathProgramCache]: Analyzing trace with hash -757573379, now seen corresponding path program 48 times [2018-10-27 15:43:50,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:50,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:50,388 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:50,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:50,388 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:50,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:51,376 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:51,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:51,377 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:51,377 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:51,377 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:51,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:51,377 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 [2018-10-27 15:43:51,384 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:43:51,384 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:43:51,463 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:43:51,463 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:43:51,467 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:51,650 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:51,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:54,263 INFO L134 CoverageAnalysis]: Checked inductivity of 3480 backedges. 0 proven. 3480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:54,283 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:54,284 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 104 [2018-10-27 15:43:54,284 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:54,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-27 15:43:54,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-27 15:43:54,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4960, Invalid=5752, Unknown=0, NotChecked=0, Total=10712 [2018-10-27 15:43:54,285 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 53 states. [2018-10-27 15:43:54,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:54,434 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-10-27 15:43:54,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-27 15:43:54,434 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 155 [2018-10-27 15:43:54,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:54,435 INFO L225 Difference]: With dead ends: 165 [2018-10-27 15:43:54,435 INFO L226 Difference]: Without dead ends: 160 [2018-10-27 15:43:54,436 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 259 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4966, Invalid=5954, Unknown=0, NotChecked=0, Total=10920 [2018-10-27 15:43:54,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-10-27 15:43:54,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2018-10-27 15:43:54,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-27 15:43:54,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 159 transitions. [2018-10-27 15:43:54,438 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 159 transitions. Word has length 155 [2018-10-27 15:43:54,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:54,439 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 159 transitions. [2018-10-27 15:43:54,439 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-27 15:43:54,439 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 159 transitions. [2018-10-27 15:43:54,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-10-27 15:43:54,439 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:54,440 INFO L375 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:54,440 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:54,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:54,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1823866493, now seen corresponding path program 49 times [2018-10-27 15:43:54,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:54,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:54,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:43:54,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:54,441 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:54,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:55,808 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:55,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:55,809 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:43:55,809 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:43:55,809 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:43:55,809 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:43:55,809 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:43:55,820 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:55,820 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:43:55,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:43:55,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:43:56,000 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:56,000 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:43:58,699 INFO L134 CoverageAnalysis]: Checked inductivity of 3626 backedges. 0 proven. 3626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:43:58,718 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:43:58,719 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 106 [2018-10-27 15:43:58,719 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:43:58,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-27 15:43:58,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-27 15:43:58,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5161, Invalid=5969, Unknown=0, NotChecked=0, Total=11130 [2018-10-27 15:43:58,720 INFO L87 Difference]: Start difference. First operand 159 states and 159 transitions. Second operand 54 states. [2018-10-27 15:43:58,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:43:58,858 INFO L93 Difference]: Finished difference Result 168 states and 168 transitions. [2018-10-27 15:43:58,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-10-27 15:43:58,858 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 158 [2018-10-27 15:43:58,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:43:58,859 INFO L225 Difference]: With dead ends: 168 [2018-10-27 15:43:58,860 INFO L226 Difference]: Without dead ends: 163 [2018-10-27 15:43:58,860 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 264 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5167, Invalid=6175, Unknown=0, NotChecked=0, Total=11342 [2018-10-27 15:43:58,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-27 15:43:58,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 162. [2018-10-27 15:43:58,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-27 15:43:58,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-10-27 15:43:58,864 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 158 [2018-10-27 15:43:58,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:43:58,864 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-10-27 15:43:58,864 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-27 15:43:58,864 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-10-27 15:43:58,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-10-27 15:43:58,865 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:43:58,865 INFO L375 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:43:58,865 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:43:58,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:43:58,866 INFO L82 PathProgramCache]: Analyzing trace with hash -185308931, now seen corresponding path program 50 times [2018-10-27 15:43:58,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:43:58,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:58,867 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:43:58,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:43:58,867 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:43:58,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:00,079 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:00,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:00,079 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:00,079 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:00,079 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:00,079 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:00,079 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:00,087 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:44:00,087 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:44:00,197 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-10-27 15:44:00,197 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:00,200 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:00,267 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:00,267 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:03,067 INFO L134 CoverageAnalysis]: Checked inductivity of 3775 backedges. 0 proven. 3775 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:03,087 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:03,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 108 [2018-10-27 15:44:03,087 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:03,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-27 15:44:03,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-27 15:44:03,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5366, Invalid=6190, Unknown=0, NotChecked=0, Total=11556 [2018-10-27 15:44:03,089 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 55 states. [2018-10-27 15:44:03,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:03,211 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-10-27 15:44:03,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-27 15:44:03,211 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 161 [2018-10-27 15:44:03,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:03,213 INFO L225 Difference]: With dead ends: 171 [2018-10-27 15:44:03,213 INFO L226 Difference]: Without dead ends: 166 [2018-10-27 15:44:03,213 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 269 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5372, Invalid=6400, Unknown=0, NotChecked=0, Total=11772 [2018-10-27 15:44:03,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-10-27 15:44:03,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2018-10-27 15:44:03,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-10-27 15:44:03,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 165 transitions. [2018-10-27 15:44:03,217 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 165 transitions. Word has length 161 [2018-10-27 15:44:03,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:03,217 INFO L481 AbstractCegarLoop]: Abstraction has 165 states and 165 transitions. [2018-10-27 15:44:03,217 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-27 15:44:03,217 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 165 transitions. [2018-10-27 15:44:03,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-27 15:44:03,218 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:03,218 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:03,218 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:03,218 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:03,218 INFO L82 PathProgramCache]: Analyzing trace with hash -866128259, now seen corresponding path program 51 times [2018-10-27 15:44:03,218 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:03,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:03,219 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:03,219 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:03,219 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:03,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:04,488 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:04,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:04,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:04,489 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:04,489 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:04,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:04,489 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:04,496 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:44:04,496 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:44:04,584 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:44:04,584 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:04,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:04,650 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:04,650 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:07,553 INFO L134 CoverageAnalysis]: Checked inductivity of 3927 backedges. 0 proven. 3927 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:07,573 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:07,573 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 110 [2018-10-27 15:44:07,573 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:07,573 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-10-27 15:44:07,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-10-27 15:44:07,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5575, Invalid=6415, Unknown=0, NotChecked=0, Total=11990 [2018-10-27 15:44:07,575 INFO L87 Difference]: Start difference. First operand 165 states and 165 transitions. Second operand 56 states. [2018-10-27 15:44:07,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:07,738 INFO L93 Difference]: Finished difference Result 174 states and 174 transitions. [2018-10-27 15:44:07,739 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-10-27 15:44:07,739 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 164 [2018-10-27 15:44:07,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:07,740 INFO L225 Difference]: With dead ends: 174 [2018-10-27 15:44:07,740 INFO L226 Difference]: Without dead ends: 169 [2018-10-27 15:44:07,740 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=5581, Invalid=6629, Unknown=0, NotChecked=0, Total=12210 [2018-10-27 15:44:07,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-27 15:44:07,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 168. [2018-10-27 15:44:07,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-10-27 15:44:07,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-10-27 15:44:07,743 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 164 [2018-10-27 15:44:07,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:07,744 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-10-27 15:44:07,744 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-10-27 15:44:07,744 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-10-27 15:44:07,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-27 15:44:07,745 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:07,745 INFO L375 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:07,745 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:07,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:07,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1975810301, now seen corresponding path program 52 times [2018-10-27 15:44:07,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:07,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:07,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:07,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:07,746 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:07,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:09,078 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:09,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:09,078 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:09,078 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:09,078 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:09,078 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:09,078 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:09,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:09,086 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:44:09,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:09,167 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:09,242 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:09,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:12,339 INFO L134 CoverageAnalysis]: Checked inductivity of 4082 backedges. 0 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:12,359 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:12,359 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 112 [2018-10-27 15:44:12,359 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:12,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-27 15:44:12,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-27 15:44:12,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5788, Invalid=6644, Unknown=0, NotChecked=0, Total=12432 [2018-10-27 15:44:12,361 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 57 states. [2018-10-27 15:44:12,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:12,471 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-10-27 15:44:12,471 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-27 15:44:12,471 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 167 [2018-10-27 15:44:12,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:12,473 INFO L225 Difference]: With dead ends: 177 [2018-10-27 15:44:12,473 INFO L226 Difference]: Without dead ends: 172 [2018-10-27 15:44:12,474 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 279 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 419 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5794, Invalid=6862, Unknown=0, NotChecked=0, Total=12656 [2018-10-27 15:44:12,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-10-27 15:44:12,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2018-10-27 15:44:12,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-10-27 15:44:12,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 171 transitions. [2018-10-27 15:44:12,476 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 171 transitions. Word has length 167 [2018-10-27 15:44:12,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:12,476 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 171 transitions. [2018-10-27 15:44:12,477 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-27 15:44:12,477 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 171 transitions. [2018-10-27 15:44:12,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-10-27 15:44:12,477 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:12,477 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:12,478 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:12,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:12,478 INFO L82 PathProgramCache]: Analyzing trace with hash -522854787, now seen corresponding path program 53 times [2018-10-27 15:44:12,478 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:12,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:12,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:12,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:12,479 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:12,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:13,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:13,782 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:13,783 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:13,783 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:13,783 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:13,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:13,783 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:13,790 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:44:13,790 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:44:13,908 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-10-27 15:44:13,908 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:13,911 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:13,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:13,980 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:17,082 INFO L134 CoverageAnalysis]: Checked inductivity of 4240 backedges. 0 proven. 4240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:17,102 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:17,103 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 114 [2018-10-27 15:44:17,103 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:17,103 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-10-27 15:44:17,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-10-27 15:44:17,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6005, Invalid=6877, Unknown=0, NotChecked=0, Total=12882 [2018-10-27 15:44:17,104 INFO L87 Difference]: Start difference. First operand 171 states and 171 transitions. Second operand 58 states. [2018-10-27 15:44:17,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:17,277 INFO L93 Difference]: Finished difference Result 180 states and 180 transitions. [2018-10-27 15:44:17,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-10-27 15:44:17,277 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 170 [2018-10-27 15:44:17,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:17,278 INFO L225 Difference]: With dead ends: 180 [2018-10-27 15:44:17,278 INFO L226 Difference]: Without dead ends: 175 [2018-10-27 15:44:17,279 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 284 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=6011, Invalid=7099, Unknown=0, NotChecked=0, Total=13110 [2018-10-27 15:44:17,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-27 15:44:17,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2018-10-27 15:44:17,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-10-27 15:44:17,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-10-27 15:44:17,282 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 170 [2018-10-27 15:44:17,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:17,282 INFO L481 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-10-27 15:44:17,282 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-10-27 15:44:17,282 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-10-27 15:44:17,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-10-27 15:44:17,283 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:17,283 INFO L375 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:17,283 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:17,283 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:17,283 INFO L82 PathProgramCache]: Analyzing trace with hash 2118682877, now seen corresponding path program 54 times [2018-10-27 15:44:17,284 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:17,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:17,284 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:17,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:17,284 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:17,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:18,437 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:18,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:18,437 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:18,437 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:18,437 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:18,437 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:18,438 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:18,447 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:44:18,447 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:44:18,523 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:44:18,523 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:18,527 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:18,603 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:18,604 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:21,788 INFO L134 CoverageAnalysis]: Checked inductivity of 4401 backedges. 0 proven. 4401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:21,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:21,808 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 116 [2018-10-27 15:44:21,808 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:21,809 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-27 15:44:21,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-27 15:44:21,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6226, Invalid=7114, Unknown=0, NotChecked=0, Total=13340 [2018-10-27 15:44:21,810 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 59 states. [2018-10-27 15:44:21,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:21,941 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-10-27 15:44:21,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-27 15:44:21,941 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 173 [2018-10-27 15:44:21,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:21,943 INFO L225 Difference]: With dead ends: 183 [2018-10-27 15:44:21,943 INFO L226 Difference]: Without dead ends: 178 [2018-10-27 15:44:21,944 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 289 SyntacticMatches, 1 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=6232, Invalid=7340, Unknown=0, NotChecked=0, Total=13572 [2018-10-27 15:44:21,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-10-27 15:44:21,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2018-10-27 15:44:21,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-27 15:44:21,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 177 transitions. [2018-10-27 15:44:21,947 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 177 transitions. Word has length 173 [2018-10-27 15:44:21,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:21,948 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 177 transitions. [2018-10-27 15:44:21,948 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-27 15:44:21,948 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 177 transitions. [2018-10-27 15:44:21,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-27 15:44:21,948 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:21,949 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:21,949 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:21,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:21,949 INFO L82 PathProgramCache]: Analyzing trace with hash -518533507, now seen corresponding path program 55 times [2018-10-27 15:44:21,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:21,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:21,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:21,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:21,950 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:21,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:23,266 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:23,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:23,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:23,267 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:23,267 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:23,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:23,267 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:23,275 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:23,275 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:44:23,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:23,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:23,421 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:23,421 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:26,790 INFO L134 CoverageAnalysis]: Checked inductivity of 4565 backedges. 0 proven. 4565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:26,810 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:26,810 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 118 [2018-10-27 15:44:26,811 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:26,811 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-27 15:44:26,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-27 15:44:26,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6451, Invalid=7355, Unknown=0, NotChecked=0, Total=13806 [2018-10-27 15:44:26,812 INFO L87 Difference]: Start difference. First operand 177 states and 177 transitions. Second operand 60 states. [2018-10-27 15:44:26,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:26,984 INFO L93 Difference]: Finished difference Result 186 states and 186 transitions. [2018-10-27 15:44:26,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-10-27 15:44:26,984 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 176 [2018-10-27 15:44:26,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:26,985 INFO L225 Difference]: With dead ends: 186 [2018-10-27 15:44:26,986 INFO L226 Difference]: Without dead ends: 181 [2018-10-27 15:44:26,986 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 294 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=6457, Invalid=7585, Unknown=0, NotChecked=0, Total=14042 [2018-10-27 15:44:26,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-10-27 15:44:26,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2018-10-27 15:44:26,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-27 15:44:26,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-10-27 15:44:26,991 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 176 [2018-10-27 15:44:26,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:26,991 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-10-27 15:44:26,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-27 15:44:26,991 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-10-27 15:44:26,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-27 15:44:26,992 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:26,992 INFO L375 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:26,992 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:26,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:26,993 INFO L82 PathProgramCache]: Analyzing trace with hash 2004916477, now seen corresponding path program 56 times [2018-10-27 15:44:26,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:26,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:26,993 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:26,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:26,994 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:27,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:28,274 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:28,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:28,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:28,275 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:28,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:28,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:28,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:28,282 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:44:28,282 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:44:28,418 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-10-27 15:44:28,418 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:28,422 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:28,563 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:28,563 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:32,064 INFO L134 CoverageAnalysis]: Checked inductivity of 4732 backedges. 0 proven. 4732 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:32,084 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:32,084 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 120 [2018-10-27 15:44:32,084 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:32,085 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-27 15:44:32,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-27 15:44:32,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6680, Invalid=7600, Unknown=0, NotChecked=0, Total=14280 [2018-10-27 15:44:32,086 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 61 states. [2018-10-27 15:44:32,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:32,281 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-10-27 15:44:32,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-27 15:44:32,281 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 179 [2018-10-27 15:44:32,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:32,282 INFO L225 Difference]: With dead ends: 189 [2018-10-27 15:44:32,283 INFO L226 Difference]: Without dead ends: 184 [2018-10-27 15:44:32,284 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 299 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6686, Invalid=7834, Unknown=0, NotChecked=0, Total=14520 [2018-10-27 15:44:32,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-27 15:44:32,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2018-10-27 15:44:32,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-10-27 15:44:32,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 183 transitions. [2018-10-27 15:44:32,287 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 183 transitions. Word has length 179 [2018-10-27 15:44:32,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:32,288 INFO L481 AbstractCegarLoop]: Abstraction has 183 states and 183 transitions. [2018-10-27 15:44:32,288 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-27 15:44:32,288 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 183 transitions. [2018-10-27 15:44:32,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-10-27 15:44:32,289 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:32,289 INFO L375 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:32,289 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:32,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:32,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1004159363, now seen corresponding path program 57 times [2018-10-27 15:44:32,290 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:32,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:32,290 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:32,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:32,290 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:32,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:33,664 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:33,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:33,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:33,664 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:33,664 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:33,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:33,664 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:33,671 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:44:33,671 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:44:33,752 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:44:33,752 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:33,755 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:33,835 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:33,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:37,448 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:37,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:37,469 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 122 [2018-10-27 15:44:37,469 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:37,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-27 15:44:37,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-27 15:44:37,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6913, Invalid=7849, Unknown=0, NotChecked=0, Total=14762 [2018-10-27 15:44:37,470 INFO L87 Difference]: Start difference. First operand 183 states and 183 transitions. Second operand 62 states. [2018-10-27 15:44:37,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:37,601 INFO L93 Difference]: Finished difference Result 192 states and 192 transitions. [2018-10-27 15:44:37,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-10-27 15:44:37,601 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 182 [2018-10-27 15:44:37,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:37,603 INFO L225 Difference]: With dead ends: 192 [2018-10-27 15:44:37,603 INFO L226 Difference]: Without dead ends: 187 [2018-10-27 15:44:37,603 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 304 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6919, Invalid=8087, Unknown=0, NotChecked=0, Total=15006 [2018-10-27 15:44:37,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-27 15:44:37,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 186. [2018-10-27 15:44:37,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-10-27 15:44:37,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-10-27 15:44:37,607 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 182 [2018-10-27 15:44:37,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:37,607 INFO L481 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-10-27 15:44:37,607 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-27 15:44:37,607 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-10-27 15:44:37,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-10-27 15:44:37,608 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:37,608 INFO L375 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:37,608 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:37,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:37,609 INFO L82 PathProgramCache]: Analyzing trace with hash 174893309, now seen corresponding path program 58 times [2018-10-27 15:44:37,609 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:37,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:37,609 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:37,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:37,610 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:37,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:39,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:39,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:39,262 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:39,263 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:39,263 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:39,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:39,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:39,274 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:39,274 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:44:39,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:39,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:39,434 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:39,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:43,144 INFO L134 CoverageAnalysis]: Checked inductivity of 5075 backedges. 0 proven. 5075 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:43,164 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:43,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 124 [2018-10-27 15:44:43,165 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:43,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-27 15:44:43,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-27 15:44:43,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7150, Invalid=8102, Unknown=0, NotChecked=0, Total=15252 [2018-10-27 15:44:43,166 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 63 states. [2018-10-27 15:44:43,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:43,351 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-10-27 15:44:43,352 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-27 15:44:43,352 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 185 [2018-10-27 15:44:43,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:43,353 INFO L225 Difference]: With dead ends: 195 [2018-10-27 15:44:43,353 INFO L226 Difference]: Without dead ends: 190 [2018-10-27 15:44:43,354 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 309 SyntacticMatches, 1 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7156, Invalid=8344, Unknown=0, NotChecked=0, Total=15500 [2018-10-27 15:44:43,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-10-27 15:44:43,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2018-10-27 15:44:43,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-27 15:44:43,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 189 transitions. [2018-10-27 15:44:43,358 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 189 transitions. Word has length 185 [2018-10-27 15:44:43,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:43,358 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 189 transitions. [2018-10-27 15:44:43,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-27 15:44:43,359 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 189 transitions. [2018-10-27 15:44:43,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-10-27 15:44:43,360 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:43,360 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:43,360 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:43,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:43,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1090498173, now seen corresponding path program 59 times [2018-10-27 15:44:43,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:43,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:43,361 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:43,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:43,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:43,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:44,878 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:44,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:44,878 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:44,878 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:44,878 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:44,878 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:44,878 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:44,886 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:44:44,886 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:44:45,024 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-10-27 15:44:45,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:45,027 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:45,105 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:45,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:48,925 INFO L134 CoverageAnalysis]: Checked inductivity of 5251 backedges. 0 proven. 5251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:48,945 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:48,946 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 126 [2018-10-27 15:44:48,946 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:48,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-10-27 15:44:48,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-10-27 15:44:48,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7391, Invalid=8359, Unknown=0, NotChecked=0, Total=15750 [2018-10-27 15:44:48,947 INFO L87 Difference]: Start difference. First operand 189 states and 189 transitions. Second operand 64 states. [2018-10-27 15:44:49,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:49,127 INFO L93 Difference]: Finished difference Result 198 states and 198 transitions. [2018-10-27 15:44:49,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-27 15:44:49,127 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 188 [2018-10-27 15:44:49,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:49,128 INFO L225 Difference]: With dead ends: 198 [2018-10-27 15:44:49,128 INFO L226 Difference]: Without dead ends: 193 [2018-10-27 15:44:49,129 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 314 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7397, Invalid=8605, Unknown=0, NotChecked=0, Total=16002 [2018-10-27 15:44:49,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-10-27 15:44:49,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 192. [2018-10-27 15:44:49,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-27 15:44:49,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-10-27 15:44:49,132 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 188 [2018-10-27 15:44:49,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:49,132 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-10-27 15:44:49,132 INFO L482 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-10-27 15:44:49,132 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-10-27 15:44:49,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-10-27 15:44:49,133 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:49,133 INFO L375 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:49,133 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:49,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:49,133 INFO L82 PathProgramCache]: Analyzing trace with hash 537704701, now seen corresponding path program 60 times [2018-10-27 15:44:49,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:49,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:49,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:49,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:49,134 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:49,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:50,575 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:50,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:50,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:50,576 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:50,576 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:50,576 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:50,576 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:50,584 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:44:50,584 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:44:50,675 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:44:50,676 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:44:50,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:50,760 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:50,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:44:54,712 INFO L134 CoverageAnalysis]: Checked inductivity of 5430 backedges. 0 proven. 5430 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:54,747 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:44:54,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2018-10-27 15:44:54,747 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:44:54,748 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-27 15:44:54,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-27 15:44:54,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7636, Invalid=8620, Unknown=0, NotChecked=0, Total=16256 [2018-10-27 15:44:54,750 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 65 states. [2018-10-27 15:44:55,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:44:55,377 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-10-27 15:44:55,377 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-27 15:44:55,378 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 191 [2018-10-27 15:44:55,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:44:55,379 INFO L225 Difference]: With dead ends: 201 [2018-10-27 15:44:55,379 INFO L226 Difference]: Without dead ends: 196 [2018-10-27 15:44:55,380 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 319 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7642, Invalid=8870, Unknown=0, NotChecked=0, Total=16512 [2018-10-27 15:44:55,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-10-27 15:44:55,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2018-10-27 15:44:55,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-10-27 15:44:55,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2018-10-27 15:44:55,384 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 191 [2018-10-27 15:44:55,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:44:55,385 INFO L481 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2018-10-27 15:44:55,385 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-27 15:44:55,385 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2018-10-27 15:44:55,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-27 15:44:55,386 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:44:55,386 INFO L375 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:44:55,386 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:44:55,386 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:44:55,387 INFO L82 PathProgramCache]: Analyzing trace with hash -828006787, now seen corresponding path program 61 times [2018-10-27 15:44:55,387 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:44:55,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:55,387 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:44:55,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:44:55,388 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:44:55,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:56,847 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:56,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:56,848 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:44:56,848 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:44:56,848 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:44:56,848 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:44:56,848 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:44:56,855 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:44:56,855 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:44:56,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:44:56,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:44:57,023 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:44:57,023 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:45:01,074 INFO L134 CoverageAnalysis]: Checked inductivity of 5612 backedges. 0 proven. 5612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:01,095 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:45:01,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 130 [2018-10-27 15:45:01,096 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:45:01,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-27 15:45:01,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-27 15:45:01,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7885, Invalid=8885, Unknown=0, NotChecked=0, Total=16770 [2018-10-27 15:45:01,097 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand 66 states. [2018-10-27 15:45:01,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:45:01,279 INFO L93 Difference]: Finished difference Result 204 states and 204 transitions. [2018-10-27 15:45:01,279 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-10-27 15:45:01,279 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 194 [2018-10-27 15:45:01,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:45:01,280 INFO L225 Difference]: With dead ends: 204 [2018-10-27 15:45:01,280 INFO L226 Difference]: Without dead ends: 199 [2018-10-27 15:45:01,280 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 454 GetRequests, 324 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=7891, Invalid=9139, Unknown=0, NotChecked=0, Total=17030 [2018-10-27 15:45:01,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-27 15:45:01,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-10-27 15:45:01,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-10-27 15:45:01,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-10-27 15:45:01,285 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 194 [2018-10-27 15:45:01,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:45:01,285 INFO L481 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-10-27 15:45:01,285 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-27 15:45:01,285 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-10-27 15:45:01,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-27 15:45:01,286 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:45:01,287 INFO L375 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:45:01,287 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:45:01,287 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:45:01,287 INFO L82 PathProgramCache]: Analyzing trace with hash -513750787, now seen corresponding path program 62 times [2018-10-27 15:45:01,287 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:45:01,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:01,288 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:45:01,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:01,288 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:45:01,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:02,787 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:02,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:02,788 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:45:02,788 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:45:02,788 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:45:02,788 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:02,788 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:45:02,814 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:45:02,814 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:45:02,963 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-10-27 15:45:02,963 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:45:02,966 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:45:03,039 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:03,039 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:45:07,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5797 backedges. 0 proven. 5797 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:07,236 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:45:07,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 132 [2018-10-27 15:45:07,236 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:45:07,237 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-27 15:45:07,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-27 15:45:07,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8138, Invalid=9154, Unknown=0, NotChecked=0, Total=17292 [2018-10-27 15:45:07,238 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 67 states. [2018-10-27 15:45:07,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:45:07,449 INFO L93 Difference]: Finished difference Result 207 states and 207 transitions. [2018-10-27 15:45:07,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-27 15:45:07,449 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 197 [2018-10-27 15:45:07,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:45:07,450 INFO L225 Difference]: With dead ends: 207 [2018-10-27 15:45:07,450 INFO L226 Difference]: Without dead ends: 202 [2018-10-27 15:45:07,451 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 461 GetRequests, 329 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2018-10-27 15:45:07,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-10-27 15:45:07,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2018-10-27 15:45:07,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-10-27 15:45:07,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2018-10-27 15:45:07,455 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 197 [2018-10-27 15:45:07,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:45:07,456 INFO L481 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2018-10-27 15:45:07,456 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-27 15:45:07,456 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2018-10-27 15:45:07,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2018-10-27 15:45:07,457 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:45:07,457 INFO L375 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:45:07,457 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:45:07,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:45:07,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1541960067, now seen corresponding path program 63 times [2018-10-27 15:45:07,458 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:45:07,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:07,459 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:45:07,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:07,459 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:45:07,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:09,017 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:09,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:09,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:45:09,017 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:45:09,017 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:45:09,017 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:09,017 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:45:09,027 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:45:09,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:45:09,122 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:45:09,122 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:45:09,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:45:09,205 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:09,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:45:13,528 INFO L134 CoverageAnalysis]: Checked inductivity of 5985 backedges. 0 proven. 5985 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:13,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:45:13,548 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 134 [2018-10-27 15:45:13,549 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:45:13,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-10-27 15:45:13,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-10-27 15:45:13,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8395, Invalid=9427, Unknown=0, NotChecked=0, Total=17822 [2018-10-27 15:45:13,550 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 68 states. [2018-10-27 15:45:13,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:45:13,706 INFO L93 Difference]: Finished difference Result 210 states and 210 transitions. [2018-10-27 15:45:13,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-27 15:45:13,706 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 200 [2018-10-27 15:45:13,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:45:13,707 INFO L225 Difference]: With dead ends: 210 [2018-10-27 15:45:13,707 INFO L226 Difference]: Without dead ends: 205 [2018-10-27 15:45:13,708 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=8401, Invalid=9689, Unknown=0, NotChecked=0, Total=18090 [2018-10-27 15:45:13,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-27 15:45:13,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-10-27 15:45:13,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-10-27 15:45:13,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 204 transitions. [2018-10-27 15:45:13,711 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 204 transitions. Word has length 200 [2018-10-27 15:45:13,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:45:13,712 INFO L481 AbstractCegarLoop]: Abstraction has 204 states and 204 transitions. [2018-10-27 15:45:13,712 INFO L482 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-10-27 15:45:13,712 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 204 transitions. [2018-10-27 15:45:13,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 204 [2018-10-27 15:45:13,713 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:45:13,713 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:45:13,713 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:45:13,713 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:45:13,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1217865475, now seen corresponding path program 64 times [2018-10-27 15:45:13,714 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:45:13,714 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:13,714 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:45:13,715 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:13,715 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:45:13,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:15,310 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:15,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:15,310 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:45:15,310 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:45:15,310 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:45:15,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:15,311 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:45:15,319 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:45:15,320 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:45:15,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:15,419 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:45:15,484 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:15,485 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:45:19,947 INFO L134 CoverageAnalysis]: Checked inductivity of 6176 backedges. 0 proven. 6176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:19,968 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:45:19,969 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 136 [2018-10-27 15:45:19,969 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:45:19,969 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-27 15:45:19,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-27 15:45:19,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8656, Invalid=9704, Unknown=0, NotChecked=0, Total=18360 [2018-10-27 15:45:19,970 INFO L87 Difference]: Start difference. First operand 204 states and 204 transitions. Second operand 69 states. [2018-10-27 15:45:20,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:45:20,118 INFO L93 Difference]: Finished difference Result 213 states and 213 transitions. [2018-10-27 15:45:20,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-27 15:45:20,118 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 203 [2018-10-27 15:45:20,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:45:20,119 INFO L225 Difference]: With dead ends: 213 [2018-10-27 15:45:20,119 INFO L226 Difference]: Without dead ends: 208 [2018-10-27 15:45:20,120 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 339 SyntacticMatches, 1 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=8662, Invalid=9970, Unknown=0, NotChecked=0, Total=18632 [2018-10-27 15:45:20,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-10-27 15:45:20,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2018-10-27 15:45:20,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-27 15:45:20,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 207 transitions. [2018-10-27 15:45:20,123 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 207 transitions. Word has length 203 [2018-10-27 15:45:20,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:45:20,124 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 207 transitions. [2018-10-27 15:45:20,124 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-27 15:45:20,124 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 207 transitions. [2018-10-27 15:45:20,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-27 15:45:20,125 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:45:20,125 INFO L375 BasicCegarLoop]: trace histogram [66, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:45:20,125 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:45:20,125 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:45:20,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1202356611, now seen corresponding path program 65 times [2018-10-27 15:45:20,125 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:45:20,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:20,126 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:45:20,126 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:20,126 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:45:20,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:21,728 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:21,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:21,729 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:45:21,729 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:45:21,729 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:45:21,729 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:21,729 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:45:21,753 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:45:21,753 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:45:21,908 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-10-27 15:45:21,909 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:45:21,912 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:45:21,986 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:21,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:45:26,557 INFO L134 CoverageAnalysis]: Checked inductivity of 6370 backedges. 0 proven. 6370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:26,577 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:45:26,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 138 [2018-10-27 15:45:26,578 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:45:26,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-10-27 15:45:26,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-10-27 15:45:26,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8921, Invalid=9985, Unknown=0, NotChecked=0, Total=18906 [2018-10-27 15:45:26,579 INFO L87 Difference]: Start difference. First operand 207 states and 207 transitions. Second operand 70 states. [2018-10-27 15:45:26,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:45:26,762 INFO L93 Difference]: Finished difference Result 216 states and 216 transitions. [2018-10-27 15:45:26,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-10-27 15:45:26,763 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 206 [2018-10-27 15:45:26,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:45:26,764 INFO L225 Difference]: With dead ends: 216 [2018-10-27 15:45:26,764 INFO L226 Difference]: Without dead ends: 211 [2018-10-27 15:45:26,765 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 344 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=8927, Invalid=10255, Unknown=0, NotChecked=0, Total=19182 [2018-10-27 15:45:26,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-10-27 15:45:26,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-10-27 15:45:26,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-27 15:45:26,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 210 transitions. [2018-10-27 15:45:26,770 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 210 transitions. Word has length 206 [2018-10-27 15:45:26,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:45:26,770 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 210 transitions. [2018-10-27 15:45:26,770 INFO L482 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-10-27 15:45:26,770 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 210 transitions. [2018-10-27 15:45:26,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-27 15:45:26,771 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:45:26,771 INFO L375 BasicCegarLoop]: trace histogram [67, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:45:26,772 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:45:26,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:45:26,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1260710141, now seen corresponding path program 66 times [2018-10-27 15:45:26,772 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:45:26,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:26,773 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:45:26,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:26,773 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:45:26,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:28,561 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:28,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:28,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:45:28,561 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:45:28,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:45:28,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:28,561 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:45:28,569 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:45:28,569 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:45:28,669 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:45:28,670 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:45:28,673 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:45:28,745 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:28,745 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:45:33,500 INFO L134 CoverageAnalysis]: Checked inductivity of 6567 backedges. 0 proven. 6567 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:33,521 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:45:33,521 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 140 [2018-10-27 15:45:33,521 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:45:33,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-27 15:45:33,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-27 15:45:33,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9190, Invalid=10270, Unknown=0, NotChecked=0, Total=19460 [2018-10-27 15:45:33,523 INFO L87 Difference]: Start difference. First operand 210 states and 210 transitions. Second operand 71 states. [2018-10-27 15:45:33,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:45:33,667 INFO L93 Difference]: Finished difference Result 219 states and 219 transitions. [2018-10-27 15:45:33,667 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-27 15:45:33,668 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 209 [2018-10-27 15:45:33,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:45:33,668 INFO L225 Difference]: With dead ends: 219 [2018-10-27 15:45:33,669 INFO L226 Difference]: Without dead ends: 214 [2018-10-27 15:45:33,669 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 349 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 531 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=9196, Invalid=10544, Unknown=0, NotChecked=0, Total=19740 [2018-10-27 15:45:33,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2018-10-27 15:45:33,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2018-10-27 15:45:33,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-10-27 15:45:33,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 213 transitions. [2018-10-27 15:45:33,674 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 213 transitions. Word has length 209 [2018-10-27 15:45:33,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:45:33,675 INFO L481 AbstractCegarLoop]: Abstraction has 213 states and 213 transitions. [2018-10-27 15:45:33,675 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-27 15:45:33,675 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 213 transitions. [2018-10-27 15:45:33,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-10-27 15:45:33,676 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:45:33,676 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:45:33,676 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:45:33,677 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:45:33,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1033933187, now seen corresponding path program 67 times [2018-10-27 15:45:33,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:45:33,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:33,677 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:45:33,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:33,678 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:45:33,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:35,489 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:35,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:35,490 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:45:35,490 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:45:35,490 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:45:35,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:35,490 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:45:35,498 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:45:35,498 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:45:35,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:35,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:45:35,675 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:35,675 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:45:40,522 INFO L134 CoverageAnalysis]: Checked inductivity of 6767 backedges. 0 proven. 6767 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:40,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:45:40,544 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 142 [2018-10-27 15:45:40,544 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:45:40,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-10-27 15:45:40,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-10-27 15:45:40,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9463, Invalid=10559, Unknown=0, NotChecked=0, Total=20022 [2018-10-27 15:45:40,546 INFO L87 Difference]: Start difference. First operand 213 states and 213 transitions. Second operand 72 states. [2018-10-27 15:45:40,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:45:40,747 INFO L93 Difference]: Finished difference Result 222 states and 222 transitions. [2018-10-27 15:45:40,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-10-27 15:45:40,747 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 212 [2018-10-27 15:45:40,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:45:40,748 INFO L225 Difference]: With dead ends: 222 [2018-10-27 15:45:40,748 INFO L226 Difference]: Without dead ends: 217 [2018-10-27 15:45:40,749 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 496 GetRequests, 354 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=9469, Invalid=10837, Unknown=0, NotChecked=0, Total=20306 [2018-10-27 15:45:40,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-27 15:45:40,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 216. [2018-10-27 15:45:40,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2018-10-27 15:45:40,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 216 transitions. [2018-10-27 15:45:40,752 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 216 transitions. Word has length 212 [2018-10-27 15:45:40,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:45:40,753 INFO L481 AbstractCegarLoop]: Abstraction has 216 states and 216 transitions. [2018-10-27 15:45:40,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-10-27 15:45:40,753 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 216 transitions. [2018-10-27 15:45:40,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-27 15:45:40,754 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:45:40,754 INFO L375 BasicCegarLoop]: trace histogram [69, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:45:40,754 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:45:40,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:45:40,755 INFO L82 PathProgramCache]: Analyzing trace with hash -2053834499, now seen corresponding path program 68 times [2018-10-27 15:45:40,755 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:45:40,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:40,755 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:45:40,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:40,756 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:45:40,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:42,518 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:42,518 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:42,519 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:45:42,519 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:45:42,519 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:45:42,519 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:42,519 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:45:42,527 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:45:42,527 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:45:42,699 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-10-27 15:45:42,699 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:45:42,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:45:42,778 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:42,778 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:45:47,758 INFO L134 CoverageAnalysis]: Checked inductivity of 6970 backedges. 0 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:47,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:45:47,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 144 [2018-10-27 15:45:47,779 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:45:47,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-27 15:45:47,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-27 15:45:47,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9740, Invalid=10852, Unknown=0, NotChecked=0, Total=20592 [2018-10-27 15:45:47,780 INFO L87 Difference]: Start difference. First operand 216 states and 216 transitions. Second operand 73 states. [2018-10-27 15:45:47,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:45:47,961 INFO L93 Difference]: Finished difference Result 225 states and 225 transitions. [2018-10-27 15:45:47,961 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-27 15:45:47,962 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 215 [2018-10-27 15:45:47,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:45:47,963 INFO L225 Difference]: With dead ends: 225 [2018-10-27 15:45:47,963 INFO L226 Difference]: Without dead ends: 220 [2018-10-27 15:45:47,963 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 359 SyntacticMatches, 1 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=9746, Invalid=11134, Unknown=0, NotChecked=0, Total=20880 [2018-10-27 15:45:47,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-10-27 15:45:47,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 219. [2018-10-27 15:45:47,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-27 15:45:47,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 219 transitions. [2018-10-27 15:45:47,967 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 219 transitions. Word has length 215 [2018-10-27 15:45:47,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:45:47,967 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 219 transitions. [2018-10-27 15:45:47,967 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-27 15:45:47,967 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 219 transitions. [2018-10-27 15:45:47,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-10-27 15:45:47,968 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:45:47,968 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:45:47,968 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:45:47,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:45:47,968 INFO L82 PathProgramCache]: Analyzing trace with hash 959798909, now seen corresponding path program 69 times [2018-10-27 15:45:47,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:45:47,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:47,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:45:47,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:47,969 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:45:48,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:49,811 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:49,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:49,811 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:45:49,811 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:45:49,811 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:45:49,811 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:49,811 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:45:49,819 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 15:45:49,819 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 15:45:49,933 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 15:45:49,933 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:45:49,937 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:45:50,009 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:50,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:45:55,148 INFO L134 CoverageAnalysis]: Checked inductivity of 7176 backedges. 0 proven. 7176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:55,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:45:55,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 146 [2018-10-27 15:45:55,170 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:45:55,171 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-10-27 15:45:55,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-10-27 15:45:55,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10021, Invalid=11149, Unknown=0, NotChecked=0, Total=21170 [2018-10-27 15:45:55,172 INFO L87 Difference]: Start difference. First operand 219 states and 219 transitions. Second operand 74 states. [2018-10-27 15:45:55,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:45:55,396 INFO L93 Difference]: Finished difference Result 228 states and 228 transitions. [2018-10-27 15:45:55,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-10-27 15:45:55,397 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 218 [2018-10-27 15:45:55,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:45:55,398 INFO L225 Difference]: With dead ends: 228 [2018-10-27 15:45:55,398 INFO L226 Difference]: Without dead ends: 223 [2018-10-27 15:45:55,399 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 364 SyntacticMatches, 1 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 555 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=10027, Invalid=11435, Unknown=0, NotChecked=0, Total=21462 [2018-10-27 15:45:55,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-10-27 15:45:55,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-10-27 15:45:55,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-10-27 15:45:55,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 222 transitions. [2018-10-27 15:45:55,403 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 222 transitions. Word has length 218 [2018-10-27 15:45:55,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:45:55,403 INFO L481 AbstractCegarLoop]: Abstraction has 222 states and 222 transitions. [2018-10-27 15:45:55,403 INFO L482 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-10-27 15:45:55,403 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 222 transitions. [2018-10-27 15:45:55,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-10-27 15:45:55,404 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:45:55,404 INFO L375 BasicCegarLoop]: trace histogram [71, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:45:55,405 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:45:55,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:45:55,405 INFO L82 PathProgramCache]: Analyzing trace with hash -1883698947, now seen corresponding path program 70 times [2018-10-27 15:45:55,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:45:55,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:55,406 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 15:45:55,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:45:55,406 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:45:55,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:57,278 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:57,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:57,279 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:45:57,279 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:45:57,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:45:57,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:45:57,279 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:45:57,287 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:45:57,287 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 15:45:57,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:45:57,396 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:45:57,471 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:45:57,471 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 15:46:02,753 INFO L134 CoverageAnalysis]: Checked inductivity of 7385 backedges. 0 proven. 7385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:46:02,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 15:46:02,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 148 [2018-10-27 15:46:02,774 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 15:46:02,775 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-27 15:46:02,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-27 15:46:02,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10306, Invalid=11450, Unknown=0, NotChecked=0, Total=21756 [2018-10-27 15:46:02,776 INFO L87 Difference]: Start difference. First operand 222 states and 222 transitions. Second operand 75 states. [2018-10-27 15:46:02,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 15:46:02,956 INFO L93 Difference]: Finished difference Result 231 states and 231 transitions. [2018-10-27 15:46:02,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-10-27 15:46:02,956 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 221 [2018-10-27 15:46:02,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 15:46:02,958 INFO L225 Difference]: With dead ends: 231 [2018-10-27 15:46:02,958 INFO L226 Difference]: Without dead ends: 226 [2018-10-27 15:46:02,959 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 369 SyntacticMatches, 1 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=10312, Invalid=11740, Unknown=0, NotChecked=0, Total=22052 [2018-10-27 15:46:02,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-10-27 15:46:02,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 225. [2018-10-27 15:46:02,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-10-27 15:46:02,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 225 transitions. [2018-10-27 15:46:02,962 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 225 transitions. Word has length 221 [2018-10-27 15:46:02,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 15:46:02,962 INFO L481 AbstractCegarLoop]: Abstraction has 225 states and 225 transitions. [2018-10-27 15:46:02,962 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-27 15:46:02,963 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 225 transitions. [2018-10-27 15:46:02,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-27 15:46:02,964 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 15:46:02,964 INFO L375 BasicCegarLoop]: trace histogram [72, 71, 71, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 15:46:02,964 INFO L424 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 15:46:02,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 15:46:02,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1406619261, now seen corresponding path program 71 times [2018-10-27 15:46:02,965 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 15:46:02,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:46:02,965 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 15:46:02,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 15:46:02,965 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 15:46:03,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 15:46:04,899 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:46:04,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:46:04,899 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 15:46:04,899 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 15:46:04,899 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 15:46:04,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 15:46:04,899 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:46:04,907 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 15:46:04,907 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 15:46:05,091 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2018-10-27 15:46:05,091 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 15:46:05,096 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 15:46:05,178 INFO L134 CoverageAnalysis]: Checked inductivity of 7597 backedges. 0 proven. 7597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 15:46:05,178 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-27 15:46:07,026 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-27 15:46:07,227 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 15:46:07,228 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 15:46:07,233 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 15:46:07,233 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 03:46:07 BoogieIcfgContainer [2018-10-27 15:46:07,233 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 15:46:07,234 INFO L168 Benchmark]: Toolchain (without parser) took 234012.86 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 807.4 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -678.7 MB). Peak memory consumption was 128.7 MB. Max. memory is 7.1 GB. [2018-10-27 15:46:07,235 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. [2018-10-27 15:46:07,236 INFO L168 Benchmark]: CACSL2BoogieTranslator took 289.52 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. [2018-10-27 15:46:07,236 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.71 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. [2018-10-27 15:46:07,236 INFO L168 Benchmark]: Boogie Preprocessor took 30.02 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. [2018-10-27 15:46:07,236 INFO L168 Benchmark]: RCFGBuilder took 384.72 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 745.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -798.9 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. [2018-10-27 15:46:07,237 INFO L168 Benchmark]: TraceAbstraction took 233279.86 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 61.9 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 109.6 MB). Peak memory consumption was 171.5 MB. Max. memory is 7.1 GB. [2018-10-27 15:46:07,239 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 289.52 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 23.71 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 30.02 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 384.72 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 745.5 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -798.9 MB). Peak memory consumption was 26.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 233279.86 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 61.9 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 109.6 MB). Peak memory consumption was 171.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 225 with TraceHistMax 72,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 107 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 233.2s OverallTime, 73 OverallIterations, 72 TraceHistogramMax, 9.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 802 SDtfs, 2625 SDslu, 19983 SDs, 0 SdLazy, 4800 SolverSat, 115 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19287 GetRequests, 13762 SyntacticMatches, 71 SemanticMatches, 5454 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20080 ImplicationChecksByTransitivity, 204.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=225occurred in iteration=72, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 72 MinimizatonAttempts, 70 StatesRemovedByMinimization, 70 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.7s SsaConstructionTime, 5.6s SatisfiabilityAnalysisTime, 208.6s InterpolantComputationTime, 16471 NumberOfCodeBlocks, 16471 NumberOfCodeBlocksAsserted, 970 NumberOfCheckSat, 24484 ConstructedInterpolants, 0 QuantifiedInterpolants, 10636916 SizeOfPredicates, 141 NumberOfNonLiveVariables, 31570 ConjunctsInSsa, 2971 ConjunctsInUnsatCore, 212 InterpolantComputations, 2 PerfectInterpolantSequences, 0/529305 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown