java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf -i ../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-dace188-m [2018-09-14 15:46:20,109 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-14 15:46:20,111 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-14 15:46:20,125 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-14 15:46:20,125 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-14 15:46:20,126 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-14 15:46:20,130 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-14 15:46:20,133 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-14 15:46:20,135 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-14 15:46:20,141 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-14 15:46:20,142 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-14 15:46:20,146 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-14 15:46:20,147 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-14 15:46:20,148 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-14 15:46:20,152 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-14 15:46:20,153 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-14 15:46:20,155 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-14 15:46:20,158 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-14 15:46:20,162 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-14 15:46:20,167 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-14 15:46:20,168 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-14 15:46:20,171 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-14 15:46:20,173 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-14 15:46:20,189 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf [2018-09-14 15:46:20,216 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-14 15:46:20,216 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-14 15:46:20,217 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-14 15:46:20,217 INFO L133 SettingsManager]: * User list type=DISABLED [2018-09-14 15:46:20,217 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-09-14 15:46:20,220 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-09-14 15:46:20,220 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-09-14 15:46:20,221 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-09-14 15:46:20,221 INFO L133 SettingsManager]: * Log string format=TERM [2018-09-14 15:46:20,221 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-09-14 15:46:20,221 INFO L133 SettingsManager]: * Interval Domain=false [2018-09-14 15:46:20,222 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-14 15:46:20,223 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-14 15:46:20,223 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-14 15:46:20,224 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-14 15:46:20,224 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-14 15:46:20,224 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-14 15:46:20,224 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-14 15:46:20,225 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-14 15:46:20,226 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-14 15:46:20,226 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-14 15:46:20,226 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-14 15:46:20,226 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-14 15:46:20,227 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-14 15:46:20,227 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-14 15:46:20,227 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-14 15:46:20,227 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-14 15:46:20,227 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-09-14 15:46:20,228 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-14 15:46:20,228 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-14 15:46:20,228 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-14 15:46:20,228 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-09-14 15:46:20,228 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-09-14 15:46:20,300 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-14 15:46:20,315 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-14 15:46:20,321 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-14 15:46:20,323 INFO L271 PluginConnector]: Initializing CDTParser... [2018-09-14 15:46:20,323 INFO L276 PluginConnector]: CDTParser initialized [2018-09-14 15:46:20,324 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-09-14 15:46:20,671 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea01e3291/4866eaa5c0484f32b89be51a4c334e3e/FLAG2f19b3972 [2018-09-14 15:46:20,815 INFO L277 CDTParser]: Found 1 translation units. [2018-09-14 15:46:20,815 INFO L159 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-09-14 15:46:20,822 INFO L325 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea01e3291/4866eaa5c0484f32b89be51a4c334e3e/FLAG2f19b3972 [2018-09-14 15:46:20,837 INFO L333 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea01e3291/4866eaa5c0484f32b89be51a4c334e3e [2018-09-14 15:46:20,846 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-14 15:46:20,849 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-09-14 15:46:20,850 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-09-14 15:46:20,851 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-09-14 15:46:20,858 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-09-14 15:46:20,859 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.09 03:46:20" (1/1) ... [2018-09-14 15:46:20,862 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@289161a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:20, skipping insertion in model container [2018-09-14 15:46:20,862 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.09 03:46:20" (1/1) ... [2018-09-14 15:46:20,874 INFO L160 ieTranslatorObserver]: Starting translation in SV-COMP mode [2018-09-14 15:46:21,074 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-14 15:46:21,092 INFO L424 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-09-14 15:46:21,098 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-14 15:46:21,115 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21 WrapperNode [2018-09-14 15:46:21,115 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-09-14 15:46:21,116 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-14 15:46:21,116 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-14 15:46:21,117 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-14 15:46:21,127 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... [2018-09-14 15:46:21,134 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... [2018-09-14 15:46:21,141 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-14 15:46:21,141 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-14 15:46:21,141 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-14 15:46:21,141 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-14 15:46:21,152 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... [2018-09-14 15:46:21,152 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... [2018-09-14 15:46:21,153 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... [2018-09-14 15:46:21,153 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... [2018-09-14 15:46:21,155 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... [2018-09-14 15:46:21,162 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... [2018-09-14 15:46:21,163 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... [2018-09-14 15:46:21,165 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-14 15:46:21,165 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-14 15:46:21,166 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-14 15:46:21,166 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-14 15:46:21,167 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-14 15:46:21,239 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-09-14 15:46:21,240 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-09-14 15:46:21,240 INFO L130 BoogieDeclarations]: Found specification of procedure f [2018-09-14 15:46:21,241 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2018-09-14 15:46:21,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-14 15:46:21,241 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-14 15:46:21,241 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-14 15:46:21,242 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-14 15:46:21,242 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-09-14 15:46:21,242 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-09-14 15:46:21,597 INFO L353 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-14 15:46:21,598 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.09 03:46:21 BoogieIcfgContainer [2018-09-14 15:46:21,598 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-14 15:46:21,603 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-14 15:46:21,603 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-14 15:46:21,606 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-14 15:46:21,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.09 03:46:20" (1/3) ... [2018-09-14 15:46:21,607 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b38d089 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.09 03:46:21, skipping insertion in model container [2018-09-14 15:46:21,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:46:21" (2/3) ... [2018-09-14 15:46:21,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b38d089 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.09 03:46:21, skipping insertion in model container [2018-09-14 15:46:21,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.09 03:46:21" (3/3) ... [2018-09-14 15:46:21,610 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_true-unreach-call1_true-termination.i [2018-09-14 15:46:21,620 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-14 15:46:21,627 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-14 15:46:21,673 INFO L130 ementStrategyFactory]: Using default assertion order modulation [2018-09-14 15:46:21,674 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-14 15:46:21,674 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-14 15:46:21,674 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-14 15:46:21,674 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-14 15:46:21,674 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-14 15:46:21,674 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-14 15:46:21,675 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-14 15:46:21,675 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-14 15:46:21,693 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-09-14 15:46:21,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-14 15:46:21,699 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:21,700 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:21,701 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:21,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1196028990, now seen corresponding path program 1 times [2018-09-14 15:46:21,710 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:21,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:21,764 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:46:21,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:21,764 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:21,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:21,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:46:21,822 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-14 15:46:21,822 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-14 15:46:21,822 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-14 15:46:21,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-09-14 15:46:21,838 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-09-14 15:46:21,839 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-14 15:46:21,841 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-09-14 15:46:21,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:21,869 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-09-14 15:46:21,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-09-14 15:46:21,871 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-09-14 15:46:21,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:21,882 INFO L225 Difference]: With dead ends: 34 [2018-09-14 15:46:21,882 INFO L226 Difference]: Without dead ends: 17 [2018-09-14 15:46:21,886 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-14 15:46:21,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-14 15:46:21,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-14 15:46:21,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-14 15:46:21,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-14 15:46:21,929 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 10 [2018-09-14 15:46:21,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:21,930 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-14 15:46:21,931 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-09-14 15:46:21,931 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-14 15:46:21,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-14 15:46:21,932 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:21,932 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:21,932 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:21,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1888530020, now seen corresponding path program 1 times [2018-09-14 15:46:21,934 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:21,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:21,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:46:21,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:21,938 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:21,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:22,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:46:22,065 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-14 15:46:22,066 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-14 15:46:22,066 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-14 15:46:22,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-14 15:46:22,068 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-14 15:46:22,068 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-14 15:46:22,069 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 3 states. [2018-09-14 15:46:22,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:22,124 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2018-09-14 15:46:22,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-14 15:46:22,125 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-09-14 15:46:22,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:22,129 INFO L225 Difference]: With dead ends: 26 [2018-09-14 15:46:22,129 INFO L226 Difference]: Without dead ends: 21 [2018-09-14 15:46:22,130 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-14 15:46:22,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-14 15:46:22,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2018-09-14 15:46:22,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-14 15:46:22,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-14 15:46:22,142 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 11 [2018-09-14 15:46:22,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:22,143 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-14 15:46:22,143 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-14 15:46:22,143 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-14 15:46:22,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-14 15:46:22,144 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:22,144 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:22,145 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:22,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1261609818, now seen corresponding path program 1 times [2018-09-14 15:46:22,145 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:22,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:22,146 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:46:22,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:22,147 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:22,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:22,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:46:22,461 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:22,462 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:46:22,481 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:46:22,481 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:46:22,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:22,512 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:22,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:46:22,573 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:22,864 WARN L178 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:46:23,056 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:46:23,077 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:23,078 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:46:23,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:46:23,094 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:46:23,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:23,116 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:23,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:46:23,172 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:23,302 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:46:23,303 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:46:23,304 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-09-14 15:46:23,305 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:46:23,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-14 15:46:23,306 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-14 15:46:23,307 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-09-14 15:46:23,307 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 6 states. [2018-09-14 15:46:23,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:23,501 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-09-14 15:46:23,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-14 15:46:23,502 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-09-14 15:46:23,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:23,503 INFO L225 Difference]: With dead ends: 30 [2018-09-14 15:46:23,504 INFO L226 Difference]: Without dead ends: 25 [2018-09-14 15:46:23,504 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 62 SyntacticMatches, 7 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-09-14 15:46:23,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-14 15:46:23,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2018-09-14 15:46:23,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-14 15:46:23,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-09-14 15:46:23,510 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-09-14 15:46:23,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:23,510 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-09-14 15:46:23,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-14 15:46:23,511 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-09-14 15:46:23,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-09-14 15:46:23,513 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:23,513 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:23,513 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:23,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1235124260, now seen corresponding path program 2 times [2018-09-14 15:46:23,514 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:23,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:23,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:46:23,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:23,515 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:23,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:23,830 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-09-14 15:46:23,830 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:23,831 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:46:23,851 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:46:23,851 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:46:23,884 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:46:23,884 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:23,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:23,936 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-09-14 15:46:23,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:24,288 WARN L178 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:46:24,590 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-09-14 15:46:24,610 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:24,611 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:46:24,626 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:46:24,627 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:46:24,654 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:46:24,655 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:24,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:24,728 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-09-14 15:46:24,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:24,857 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-09-14 15:46:24,859 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:46:24,859 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9, 8, 9] total 15 [2018-09-14 15:46:24,859 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:46:24,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-14 15:46:24,860 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-14 15:46:24,861 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2018-09-14 15:46:24,862 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-09-14 15:46:25,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:25,017 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-09-14 15:46:25,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-14 15:46:25,017 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-09-14 15:46:25,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:25,019 INFO L225 Difference]: With dead ends: 34 [2018-09-14 15:46:25,019 INFO L226 Difference]: Without dead ends: 29 [2018-09-14 15:46:25,021 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 84 SyntacticMatches, 11 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-09-14 15:46:25,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-14 15:46:25,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2018-09-14 15:46:25,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-14 15:46:25,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-09-14 15:46:25,027 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 25 [2018-09-14 15:46:25,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:25,028 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-09-14 15:46:25,028 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-14 15:46:25,028 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-09-14 15:46:25,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-14 15:46:25,029 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:25,029 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:25,029 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:25,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1046211866, now seen corresponding path program 3 times [2018-09-14 15:46:25,030 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:25,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:25,031 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:46:25,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:25,031 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:25,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:25,301 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-09-14 15:46:25,301 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:25,301 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:46:25,314 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-14 15:46:25,314 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-14 15:46:25,371 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-14 15:46:25,372 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:25,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:25,456 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-09-14 15:46:25,457 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:25,869 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-09-14 15:46:25,890 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:25,890 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:46:25,907 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-14 15:46:25,907 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-14 15:46:25,955 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-14 15:46:25,956 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:25,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:26,029 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-09-14 15:46:26,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:26,209 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-09-14 15:46:26,211 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:46:26,211 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 12, 10, 12] total 20 [2018-09-14 15:46:26,211 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:46:26,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-14 15:46:26,212 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-14 15:46:26,212 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2018-09-14 15:46:26,213 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 10 states. [2018-09-14 15:46:26,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:26,421 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2018-09-14 15:46:26,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-14 15:46:26,422 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-09-14 15:46:26,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:26,424 INFO L225 Difference]: With dead ends: 38 [2018-09-14 15:46:26,424 INFO L226 Difference]: Without dead ends: 33 [2018-09-14 15:46:26,425 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 106 SyntacticMatches, 15 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2018-09-14 15:46:26,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-14 15:46:26,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-09-14 15:46:26,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-14 15:46:26,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2018-09-14 15:46:26,432 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 32 [2018-09-14 15:46:26,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:26,432 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2018-09-14 15:46:26,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-14 15:46:26,433 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2018-09-14 15:46:26,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-09-14 15:46:26,434 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:26,434 INFO L376 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:26,434 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:26,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1312440804, now seen corresponding path program 4 times [2018-09-14 15:46:26,435 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:26,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:26,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:46:26,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:26,436 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:26,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:26,926 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-09-14 15:46:26,926 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:26,926 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:46:26,934 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-14 15:46:26,934 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-14 15:46:26,981 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-14 15:46:26,982 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:26,985 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:27,061 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-09-14 15:46:27,061 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:27,620 WARN L178 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:46:28,162 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-14 15:46:28,183 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:28,183 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:46:28,200 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-14 15:46:28,200 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-14 15:46:28,237 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-14 15:46:28,237 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:28,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:28,419 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-09-14 15:46:28,419 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:28,693 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-14 15:46:28,695 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:46:28,695 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15, 12, 15] total 25 [2018-09-14 15:46:28,695 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:46:28,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-14 15:46:28,696 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-14 15:46:28,697 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2018-09-14 15:46:28,697 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 12 states. [2018-09-14 15:46:28,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:28,976 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2018-09-14 15:46:28,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-14 15:46:28,977 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2018-09-14 15:46:28,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:28,978 INFO L225 Difference]: With dead ends: 42 [2018-09-14 15:46:28,979 INFO L226 Difference]: Without dead ends: 37 [2018-09-14 15:46:28,979 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 128 SyntacticMatches, 19 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=144, Invalid=668, Unknown=0, NotChecked=0, Total=812 [2018-09-14 15:46:28,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-14 15:46:28,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2018-09-14 15:46:28,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-14 15:46:28,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-09-14 15:46:28,986 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2018-09-14 15:46:28,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:28,987 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-09-14 15:46:28,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-14 15:46:28,987 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-09-14 15:46:28,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-14 15:46:28,988 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:28,988 INFO L376 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:28,989 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:28,989 INFO L82 PathProgramCache]: Analyzing trace with hash -341760294, now seen corresponding path program 5 times [2018-09-14 15:46:28,989 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:28,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:28,990 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:46:28,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:28,991 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:29,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:29,253 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-14 15:46:29,253 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:29,253 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:46:29,263 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-14 15:46:29,263 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:46:29,314 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-14 15:46:29,315 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:29,318 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:29,425 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-14 15:46:29,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:32,233 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-09-14 15:46:32,255 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:32,255 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:46:32,272 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-14 15:46:32,272 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:46:32,348 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-14 15:46:32,348 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:32,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:32,451 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-09-14 15:46:32,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:32,722 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-09-14 15:46:32,728 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:46:32,728 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 18, 14, 18] total 30 [2018-09-14 15:46:32,729 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:46:32,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-14 15:46:32,729 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-14 15:46:32,730 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=747, Unknown=1, NotChecked=0, Total=870 [2018-09-14 15:46:32,730 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 14 states. [2018-09-14 15:46:33,473 WARN L178 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-09-14 15:46:33,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:33,639 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2018-09-14 15:46:33,640 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-14 15:46:33,640 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 46 [2018-09-14 15:46:33,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:33,641 INFO L225 Difference]: With dead ends: 46 [2018-09-14 15:46:33,641 INFO L226 Difference]: Without dead ends: 41 [2018-09-14 15:46:33,642 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 150 SyntacticMatches, 23 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=197, Invalid=992, Unknown=1, NotChecked=0, Total=1190 [2018-09-14 15:46:33,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-14 15:46:33,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2018-09-14 15:46:33,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-14 15:46:33,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2018-09-14 15:46:33,649 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 46 [2018-09-14 15:46:33,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:33,650 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2018-09-14 15:46:33,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-14 15:46:33,650 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2018-09-14 15:46:33,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-09-14 15:46:33,651 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:33,651 INFO L376 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:33,652 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:33,652 INFO L82 PathProgramCache]: Analyzing trace with hash -2000679844, now seen corresponding path program 6 times [2018-09-14 15:46:33,652 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:33,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:33,653 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:46:33,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:33,653 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:33,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:34,006 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-09-14 15:46:34,007 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:34,007 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:46:34,014 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-14 15:46:34,015 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-14 15:46:34,084 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-14 15:46:34,084 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:34,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:34,180 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-09-14 15:46:34,181 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:35,287 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-09-14 15:46:35,310 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:35,310 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:46:35,325 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-14 15:46:35,326 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-14 15:46:35,425 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-14 15:46:35,425 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:35,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:35,489 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-09-14 15:46:35,489 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:35,681 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (13)] Exception during sending of exit command (exit): Broken pipe [2018-09-14 15:46:35,683 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:46:35,684 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 21, 16, 21] total 35 [2018-09-14 15:46:35,684 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:46:35,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-14 15:46:35,684 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-14 15:46:35,685 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1032, Unknown=0, NotChecked=0, Total=1190 [2018-09-14 15:46:35,685 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 16 states. [2018-09-14 15:46:36,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:36,146 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2018-09-14 15:46:36,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-14 15:46:36,146 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 53 [2018-09-14 15:46:36,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:36,148 INFO L225 Difference]: With dead ends: 50 [2018-09-14 15:46:36,148 INFO L226 Difference]: Without dead ends: 45 [2018-09-14 15:46:36,150 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 172 SyntacticMatches, 27 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=260, Invalid=1380, Unknown=0, NotChecked=0, Total=1640 [2018-09-14 15:46:36,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-09-14 15:46:36,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-09-14 15:46:36,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-14 15:46:36,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2018-09-14 15:46:36,156 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 53 [2018-09-14 15:46:36,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:36,157 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2018-09-14 15:46:36,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-14 15:46:36,157 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2018-09-14 15:46:36,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-09-14 15:46:36,158 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:36,159 INFO L376 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:36,159 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:36,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1151446886, now seen corresponding path program 7 times [2018-09-14 15:46:36,159 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:36,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:36,160 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:46:36,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:36,160 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:36,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:36,613 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-09-14 15:46:36,613 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:36,613 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:46:36,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:46:36,623 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:46:36,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:36,655 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:36,898 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-09-14 15:46:36,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:40,494 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-09-14 15:46:40,515 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:40,515 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:46:40,533 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:46:40,533 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:46:40,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:40,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:40,657 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-09-14 15:46:40,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:41,034 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-09-14 15:46:41,036 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:46:41,036 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 24, 18, 24] total 40 [2018-09-14 15:46:41,036 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:46:41,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-14 15:46:41,037 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-14 15:46:41,037 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1363, Unknown=1, NotChecked=0, Total=1560 [2018-09-14 15:46:41,038 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 18 states. [2018-09-14 15:46:41,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:41,610 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2018-09-14 15:46:41,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-14 15:46:41,611 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 60 [2018-09-14 15:46:41,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:41,612 INFO L225 Difference]: With dead ends: 54 [2018-09-14 15:46:41,612 INFO L226 Difference]: Without dead ends: 49 [2018-09-14 15:46:41,614 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 194 SyntacticMatches, 31 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=329, Invalid=1832, Unknown=1, NotChecked=0, Total=2162 [2018-09-14 15:46:41,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-14 15:46:41,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2018-09-14 15:46:41,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-14 15:46:41,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2018-09-14 15:46:41,621 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 60 [2018-09-14 15:46:41,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:41,622 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2018-09-14 15:46:41,622 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-14 15:46:41,622 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2018-09-14 15:46:41,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-09-14 15:46:41,624 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:41,624 INFO L376 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:41,624 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:41,624 INFO L82 PathProgramCache]: Analyzing trace with hash -210474340, now seen corresponding path program 8 times [2018-09-14 15:46:41,624 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:41,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:41,625 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:46:41,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:41,626 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:41,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:42,111 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-09-14 15:46:42,111 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:42,111 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:46:42,120 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:46:42,120 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:46:42,144 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:46:42,145 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:42,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:42,323 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-09-14 15:46:42,323 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:43,583 WARN L178 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:46:45,061 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-09-14 15:46:45,081 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:45,082 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:46:45,097 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:46:45,097 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:46:45,147 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:46:45,147 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:45,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:45,232 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-09-14 15:46:45,232 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:46:45,511 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-09-14 15:46:45,513 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:46:45,513 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 27, 20, 27] total 45 [2018-09-14 15:46:45,514 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:46:45,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-14 15:46:45,515 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-14 15:46:45,515 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1740, Unknown=0, NotChecked=0, Total=1980 [2018-09-14 15:46:45,516 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand 20 states. [2018-09-14 15:46:46,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:46:46,128 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2018-09-14 15:46:46,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-14 15:46:46,129 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-09-14 15:46:46,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:46:46,131 INFO L225 Difference]: With dead ends: 58 [2018-09-14 15:46:46,131 INFO L226 Difference]: Without dead ends: 53 [2018-09-14 15:46:46,132 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 216 SyntacticMatches, 35 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=408, Invalid=2348, Unknown=0, NotChecked=0, Total=2756 [2018-09-14 15:46:46,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-09-14 15:46:46,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2018-09-14 15:46:46,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-14 15:46:46,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2018-09-14 15:46:46,139 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 67 [2018-09-14 15:46:46,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:46:46,139 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2018-09-14 15:46:46,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-14 15:46:46,140 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2018-09-14 15:46:46,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-09-14 15:46:46,141 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:46:46,141 INFO L376 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:46:46,141 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:46:46,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1156541018, now seen corresponding path program 9 times [2018-09-14 15:46:46,142 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:46:46,142 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:46,143 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:46:46,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:46:46,143 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:46:46,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:46:46,677 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-09-14 15:46:46,677 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:46:46,677 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:46:46,685 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-14 15:46:46,686 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-14 15:46:59,161 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-14 15:46:59,161 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:46:59,165 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:46:59,234 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-09-14 15:46:59,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:01,373 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-09-14 15:47:01,394 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:01,394 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:47:01,410 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-14 15:47:01,410 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-14 15:47:01,636 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-14 15:47:01,636 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:47:01,641 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:01,932 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-09-14 15:47:01,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:02,279 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-09-14 15:47:02,281 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:47:02,281 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 30, 22, 30] total 50 [2018-09-14 15:47:02,281 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:47:02,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-14 15:47:02,282 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-14 15:47:02,282 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=2163, Unknown=0, NotChecked=0, Total=2450 [2018-09-14 15:47:02,283 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand 22 states. [2018-09-14 15:47:03,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:47:03,205 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-09-14 15:47:03,205 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-14 15:47:03,205 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 74 [2018-09-14 15:47:03,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:47:03,207 INFO L225 Difference]: With dead ends: 62 [2018-09-14 15:47:03,208 INFO L226 Difference]: Without dead ends: 57 [2018-09-14 15:47:03,209 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 238 SyntacticMatches, 39 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=494, Invalid=2928, Unknown=0, NotChecked=0, Total=3422 [2018-09-14 15:47:03,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-09-14 15:47:03,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2018-09-14 15:47:03,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-14 15:47:03,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2018-09-14 15:47:03,217 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 74 [2018-09-14 15:47:03,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:47:03,217 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2018-09-14 15:47:03,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-14 15:47:03,218 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2018-09-14 15:47:03,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-09-14 15:47:03,219 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:47:03,219 INFO L376 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:47:03,220 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:47:03,220 INFO L82 PathProgramCache]: Analyzing trace with hash -1694050084, now seen corresponding path program 10 times [2018-09-14 15:47:03,220 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:47:03,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:03,221 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:47:03,221 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:03,221 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:47:03,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:47:03,808 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-09-14 15:47:03,809 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:03,809 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:47:03,819 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-14 15:47:03,820 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-14 15:47:03,846 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-14 15:47:03,847 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:47:03,850 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:03,932 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-09-14 15:47:03,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:04,996 WARN L178 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:47:05,101 WARN L178 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:47:06,625 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-09-14 15:47:06,645 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:06,646 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:47:06,662 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-14 15:47:06,662 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-14 15:47:06,728 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-14 15:47:06,728 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:47:06,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:06,841 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-09-14 15:47:06,842 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:07,196 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-09-14 15:47:07,197 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:47:07,198 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 33, 24, 33] total 55 [2018-09-14 15:47:07,198 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:47:07,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-14 15:47:07,199 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-14 15:47:07,199 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=2632, Unknown=0, NotChecked=0, Total=2970 [2018-09-14 15:47:07,200 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 24 states. [2018-09-14 15:47:08,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:47:08,106 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2018-09-14 15:47:08,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-14 15:47:08,106 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 81 [2018-09-14 15:47:08,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:47:08,108 INFO L225 Difference]: With dead ends: 66 [2018-09-14 15:47:08,108 INFO L226 Difference]: Without dead ends: 61 [2018-09-14 15:47:08,110 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 260 SyntacticMatches, 43 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 586 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=588, Invalid=3572, Unknown=0, NotChecked=0, Total=4160 [2018-09-14 15:47:08,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-14 15:47:08,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-09-14 15:47:08,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-14 15:47:08,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2018-09-14 15:47:08,118 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 81 [2018-09-14 15:47:08,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:47:08,118 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2018-09-14 15:47:08,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-14 15:47:08,118 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2018-09-14 15:47:08,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-09-14 15:47:08,120 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:47:08,120 INFO L376 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:47:08,120 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:47:08,120 INFO L82 PathProgramCache]: Analyzing trace with hash 246445082, now seen corresponding path program 11 times [2018-09-14 15:47:08,121 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:47:08,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:08,121 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:47:08,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:08,122 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:47:08,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:47:09,193 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-09-14 15:47:09,193 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:09,193 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:47:09,201 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-14 15:47:09,201 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:47:14,169 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-14 15:47:14,170 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:47:14,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:14,309 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-09-14 15:47:14,310 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:17,049 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-09-14 15:47:17,071 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:17,071 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:47:17,086 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-14 15:47:17,086 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:47:17,414 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-14 15:47:17,414 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:47:17,421 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:17,476 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-09-14 15:47:17,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:17,809 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-09-14 15:47:17,811 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:47:17,812 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 36, 26, 36] total 60 [2018-09-14 15:47:17,812 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:47:17,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-14 15:47:17,813 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-14 15:47:17,814 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=3147, Unknown=0, NotChecked=0, Total=3540 [2018-09-14 15:47:17,814 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand 26 states. [2018-09-14 15:47:19,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:47:19,092 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2018-09-14 15:47:19,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-14 15:47:19,093 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 88 [2018-09-14 15:47:19,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:47:19,094 INFO L225 Difference]: With dead ends: 70 [2018-09-14 15:47:19,094 INFO L226 Difference]: Without dead ends: 65 [2018-09-14 15:47:19,096 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 282 SyntacticMatches, 47 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=690, Invalid=4280, Unknown=0, NotChecked=0, Total=4970 [2018-09-14 15:47:19,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-09-14 15:47:19,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2018-09-14 15:47:19,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-14 15:47:19,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2018-09-14 15:47:19,103 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 88 [2018-09-14 15:47:19,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:47:19,104 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2018-09-14 15:47:19,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-14 15:47:19,104 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2018-09-14 15:47:19,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-09-14 15:47:19,106 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:47:19,106 INFO L376 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:47:19,106 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:47:19,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1503352604, now seen corresponding path program 12 times [2018-09-14 15:47:19,106 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:47:19,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:19,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:47:19,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:19,108 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:47:19,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:47:20,684 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-09-14 15:47:20,685 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:20,685 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:47:20,700 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-14 15:47:20,701 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-14 15:47:46,003 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-14 15:47:46,003 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:47:46,100 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:46,347 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-09-14 15:47:46,348 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:50,089 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-09-14 15:47:50,110 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:50,111 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:47:50,127 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-14 15:47:50,127 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-14 15:47:50,466 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-14 15:47:50,466 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:47:50,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:50,549 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-09-14 15:47:50,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:51,002 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-09-14 15:47:51,004 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:47:51,005 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 39, 28, 39] total 65 [2018-09-14 15:47:51,005 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:47:51,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-14 15:47:51,007 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-14 15:47:51,008 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=3708, Unknown=0, NotChecked=0, Total=4160 [2018-09-14 15:47:51,009 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand 28 states. [2018-09-14 15:47:52,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:47:52,211 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2018-09-14 15:47:52,211 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-14 15:47:52,212 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 95 [2018-09-14 15:47:52,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:47:52,213 INFO L225 Difference]: With dead ends: 74 [2018-09-14 15:47:52,214 INFO L226 Difference]: Without dead ends: 69 [2018-09-14 15:47:52,215 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 304 SyntacticMatches, 51 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 835 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=800, Invalid=5052, Unknown=0, NotChecked=0, Total=5852 [2018-09-14 15:47:52,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-09-14 15:47:52,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2018-09-14 15:47:52,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-09-14 15:47:52,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2018-09-14 15:47:52,223 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 95 [2018-09-14 15:47:52,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:47:52,223 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2018-09-14 15:47:52,223 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-14 15:47:52,223 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2018-09-14 15:47:52,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-09-14 15:47:52,225 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:47:52,225 INFO L376 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:47:52,225 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:47:52,225 INFO L82 PathProgramCache]: Analyzing trace with hash 1308454362, now seen corresponding path program 13 times [2018-09-14 15:47:52,225 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:47:52,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:52,226 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:47:52,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:52,227 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:47:52,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:47:52,797 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-09-14 15:47:52,797 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:52,798 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-14 15:47:52,806 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:47:52,806 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:47:52,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:47:52,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:52,930 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-09-14 15:47:52,930 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:56,743 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-09-14 15:47:56,764 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:56,765 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:47:56,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:47:56,780 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:47:56,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:47:56,860 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:56,940 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-09-14 15:47:56,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:47:57,288 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-09-14 15:47:57,289 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:47:57,290 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 42, 30, 42] total 70 [2018-09-14 15:47:57,290 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:47:57,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-14 15:47:57,290 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-14 15:47:57,292 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=515, Invalid=4315, Unknown=0, NotChecked=0, Total=4830 [2018-09-14 15:47:57,292 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 30 states. [2018-09-14 15:47:58,158 WARN L178 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-09-14 15:47:58,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:47:58,806 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-09-14 15:47:58,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-14 15:47:58,807 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 102 [2018-09-14 15:47:58,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:47:58,809 INFO L225 Difference]: With dead ends: 78 [2018-09-14 15:47:58,809 INFO L226 Difference]: Without dead ends: 73 [2018-09-14 15:47:58,812 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 326 SyntacticMatches, 55 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 976 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=918, Invalid=5888, Unknown=0, NotChecked=0, Total=6806 [2018-09-14 15:47:58,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-09-14 15:47:58,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2018-09-14 15:47:58,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-09-14 15:47:58,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2018-09-14 15:47:58,818 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 102 [2018-09-14 15:47:58,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:47:58,819 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2018-09-14 15:47:58,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-14 15:47:58,819 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2018-09-14 15:47:58,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-09-14 15:47:58,820 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:47:58,821 INFO L376 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:47:58,821 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:47:58,821 INFO L82 PathProgramCache]: Analyzing trace with hash 2052449628, now seen corresponding path program 14 times [2018-09-14 15:47:58,821 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:47:58,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:58,822 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:47:58,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:47:58,822 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:47:58,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:47:59,607 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-09-14 15:47:59,607 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:47:59,607 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-09-14 15:47:59,619 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:47:59,620 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:47:59,656 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:47:59,656 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:47:59,660 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:47:59,747 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-09-14 15:47:59,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:48:04,053 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-09-14 15:48:04,073 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:48:04,074 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:48:04,088 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:48:04,089 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:48:04,178 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:48:04,179 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:48:04,185 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:48:04,282 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-09-14 15:48:04,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:48:04,636 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-09-14 15:48:04,639 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:48:04,639 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 45, 32, 45] total 75 [2018-09-14 15:48:04,639 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:48:04,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-09-14 15:48:04,640 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-09-14 15:48:04,643 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=4968, Unknown=0, NotChecked=0, Total=5550 [2018-09-14 15:48:04,643 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand 32 states. [2018-09-14 15:48:06,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:48:06,873 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2018-09-14 15:48:06,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-09-14 15:48:06,874 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 109 [2018-09-14 15:48:06,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:48:06,876 INFO L225 Difference]: With dead ends: 82 [2018-09-14 15:48:06,876 INFO L226 Difference]: Without dead ends: 77 [2018-09-14 15:48:06,879 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 348 SyntacticMatches, 59 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1044, Invalid=6788, Unknown=0, NotChecked=0, Total=7832 [2018-09-14 15:48:06,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-09-14 15:48:06,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2018-09-14 15:48:06,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-09-14 15:48:06,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2018-09-14 15:48:06,888 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 109 [2018-09-14 15:48:06,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:48:06,890 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2018-09-14 15:48:06,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-09-14 15:48:06,890 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2018-09-14 15:48:06,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-09-14 15:48:06,891 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:48:06,892 INFO L376 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:48:06,892 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:48:06,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1489872998, now seen corresponding path program 15 times [2018-09-14 15:48:06,892 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:48:06,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:48:06,893 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:48:06,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:48:06,893 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:48:06,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:48:08,056 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-09-14 15:48:08,056 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:48:08,056 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-09-14 15:48:08,064 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-14 15:48:08,064 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-14 15:49:40,376 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-14 15:49:40,376 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:49:42,502 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:49:42,663 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-09-14 15:49:42,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:49:50,249 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-09-14 15:49:50,270 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:49:50,270 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:49:50,286 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-14 15:49:50,286 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-14 15:49:50,892 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-14 15:49:50,892 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:49:50,900 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:49:51,053 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-09-14 15:49:51,053 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:49:51,755 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-09-14 15:49:51,756 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:49:51,756 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 48, 34, 48] total 80 [2018-09-14 15:49:51,756 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:49:51,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-09-14 15:49:51,757 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-09-14 15:49:51,758 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=5667, Unknown=1, NotChecked=0, Total=6320 [2018-09-14 15:49:51,759 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 34 states. [2018-09-14 15:49:53,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:49:53,507 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2018-09-14 15:49:53,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-09-14 15:49:53,507 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 116 [2018-09-14 15:49:53,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:49:53,509 INFO L225 Difference]: With dead ends: 86 [2018-09-14 15:49:53,509 INFO L226 Difference]: Without dead ends: 81 [2018-09-14 15:49:53,511 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 370 SyntacticMatches, 63 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=1177, Invalid=7752, Unknown=1, NotChecked=0, Total=8930 [2018-09-14 15:49:53,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-09-14 15:49:53,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2018-09-14 15:49:53,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-09-14 15:49:53,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2018-09-14 15:49:53,517 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 116 [2018-09-14 15:49:53,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:49:53,517 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2018-09-14 15:49:53,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-09-14 15:49:53,518 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2018-09-14 15:49:53,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-09-14 15:49:53,519 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:49:53,519 INFO L376 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:49:53,519 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:49:53,519 INFO L82 PathProgramCache]: Analyzing trace with hash -111508580, now seen corresponding path program 16 times [2018-09-14 15:49:53,519 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:49:53,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:49:53,520 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:49:53,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:49:53,520 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:49:53,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:49:54,986 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-09-14 15:49:54,987 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:49:54,987 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-09-14 15:49:54,995 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-14 15:49:54,995 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-14 15:49:55,034 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-14 15:49:55,034 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:49:55,042 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:49:55,133 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-09-14 15:49:55,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:50:05,762 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-09-14 15:50:05,783 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:05,783 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-14 15:50:05,799 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-14 15:50:05,800 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-14 15:50:05,904 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-14 15:50:05,904 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:50:05,911 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:50:06,010 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-09-14 15:50:06,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:50:06,464 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-09-14 15:50:06,465 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:50:06,466 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 51, 36, 51] total 85 [2018-09-14 15:50:06,466 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:50:06,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-09-14 15:50:06,467 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-09-14 15:50:06,468 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=727, Invalid=6412, Unknown=1, NotChecked=0, Total=7140 [2018-09-14 15:50:06,468 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand 36 states. [2018-09-14 15:50:08,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:50:08,486 INFO L93 Difference]: Finished difference Result 90 states and 107 transitions. [2018-09-14 15:50:08,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-09-14 15:50:08,487 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 123 [2018-09-14 15:50:08,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:50:08,488 INFO L225 Difference]: With dead ends: 90 [2018-09-14 15:50:08,488 INFO L226 Difference]: Without dead ends: 85 [2018-09-14 15:50:08,489 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 392 SyntacticMatches, 67 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1449 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=1319, Invalid=8780, Unknown=1, NotChecked=0, Total=10100 [2018-09-14 15:50:08,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-09-14 15:50:08,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2018-09-14 15:50:08,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-09-14 15:50:08,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2018-09-14 15:50:08,495 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 123 [2018-09-14 15:50:08,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:50:08,496 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2018-09-14 15:50:08,496 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-09-14 15:50:08,496 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2018-09-14 15:50:08,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-09-14 15:50:08,497 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:50:08,497 INFO L376 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:50:08,497 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:50:08,497 INFO L82 PathProgramCache]: Analyzing trace with hash -307547814, now seen corresponding path program 17 times [2018-09-14 15:50:08,498 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:50:08,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:08,498 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:50:08,498 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:08,499 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:50:08,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:09,675 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-09-14 15:50:09,675 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:09,675 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-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 [2018-09-14 15:50:09,683 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-14 15:50:09,683 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown