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/simple_true-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-69f5bdd-m [2018-09-18 09:59:16,110 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-18 09:59:16,111 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-18 09:59:16,128 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-18 09:59:16,129 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-18 09:59:16,130 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-18 09:59:16,131 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-18 09:59:16,133 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-18 09:59:16,134 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-18 09:59:16,135 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-18 09:59:16,136 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-18 09:59:16,136 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-18 09:59:16,137 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-18 09:59:16,138 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-18 09:59:16,139 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-18 09:59:16,140 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-18 09:59:16,141 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-18 09:59:16,143 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-18 09:59:16,144 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-18 09:59:16,146 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-18 09:59:16,147 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-18 09:59:16,148 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-18 09:59:16,150 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-18 09:59:16,151 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-18 09:59:16,151 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-18 09:59:16,152 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-18 09:59:16,153 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-18 09:59:16,154 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-18 09:59:16,154 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-18 09:59:16,155 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-18 09:59:16,156 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-18 09:59:16,156 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-09-18 09:59:16,157 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-18 09:59:16,157 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-18 09:59:16,158 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-18 09:59:16,159 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-18 09:59:16,159 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 [2018-09-18 09:59:16,182 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-18 09:59:16,183 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-18 09:59:16,185 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-18 09:59:16,185 INFO L133 SettingsManager]: * User list type=DISABLED [2018-09-18 09:59:16,185 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-09-18 09:59:16,185 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-09-18 09:59:16,186 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-09-18 09:59:16,186 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-09-18 09:59:16,186 INFO L133 SettingsManager]: * Log string format=TERM [2018-09-18 09:59:16,186 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-09-18 09:59:16,186 INFO L133 SettingsManager]: * Parallel states before merging=1 [2018-09-18 09:59:16,187 INFO L133 SettingsManager]: * Interval Domain=false [2018-09-18 09:59:16,187 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-18 09:59:16,188 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-18 09:59:16,188 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-18 09:59:16,188 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-18 09:59:16,188 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-18 09:59:16,188 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-18 09:59:16,189 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-18 09:59:16,189 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-18 09:59:16,190 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-18 09:59:16,190 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-18 09:59:16,190 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-18 09:59:16,190 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-18 09:59:16,190 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-18 09:59:16,190 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-18 09:59:16,191 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-18 09:59:16,191 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-18 09:59:16,191 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-09-18 09:59:16,191 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-18 09:59:16,191 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-18 09:59:16,192 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-18 09:59:16,192 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-09-18 09:59:16,192 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-09-18 09:59:16,254 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-18 09:59:16,270 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-18 09:59:16,277 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-18 09:59:16,278 INFO L271 PluginConnector]: Initializing CDTParser... [2018-09-18 09:59:16,279 INFO L276 PluginConnector]: CDTParser initialized [2018-09-18 09:59:16,280 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call1.i [2018-09-18 09:59:16,624 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d095c1138/f680ae04eca04b2f988dcfa156dc719a/FLAG3cd18fd3d [2018-09-18 09:59:16,737 INFO L277 CDTParser]: Found 1 translation units. [2018-09-18 09:59:16,738 INFO L159 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call1.i [2018-09-18 09:59:16,746 INFO L325 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d095c1138/f680ae04eca04b2f988dcfa156dc719a/FLAG3cd18fd3d [2018-09-18 09:59:16,760 INFO L333 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d095c1138/f680ae04eca04b2f988dcfa156dc719a [2018-09-18 09:59:16,769 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-18 09:59:16,772 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-09-18 09:59:16,774 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-09-18 09:59:16,774 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-09-18 09:59:16,780 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-09-18 09:59:16,781 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.09 09:59:16" (1/1) ... [2018-09-18 09:59:16,784 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f217a98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:16, skipping insertion in model container [2018-09-18 09:59:16,784 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.09 09:59:16" (1/1) ... [2018-09-18 09:59:16,796 INFO L160 ieTranslatorObserver]: Starting translation in SV-COMP mode [2018-09-18 09:59:17,034 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-18 09:59:17,053 INFO L424 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-09-18 09:59:17,056 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-18 09:59:17,067 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17 WrapperNode [2018-09-18 09:59:17,067 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-09-18 09:59:17,068 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-18 09:59:17,068 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-18 09:59:17,068 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-18 09:59:17,075 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (1/1) ... [2018-09-18 09:59:17,079 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (1/1) ... [2018-09-18 09:59:17,084 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-18 09:59:17,084 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-18 09:59:17,084 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-18 09:59:17,084 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-18 09:59:17,092 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (1/1) ... [2018-09-18 09:59:17,092 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (1/1) ... [2018-09-18 09:59:17,093 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (1/1) ... [2018-09-18 09:59:17,093 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (1/1) ... [2018-09-18 09:59:17,094 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (1/1) ... [2018-09-18 09:59:17,099 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (1/1) ... [2018-09-18 09:59:17,100 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (1/1) ... [2018-09-18 09:59:17,101 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-18 09:59:17,102 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-18 09:59:17,102 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-18 09:59:17,102 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-18 09:59:17,103 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (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 [2018-09-18 09:59:17,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-09-18 09:59:17,166 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-09-18 09:59:17,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-18 09:59:17,166 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-18 09:59:17,166 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-18 09:59:17,167 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-18 09:59:17,167 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-09-18 09:59:17,167 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-09-18 09:59:17,381 INFO L356 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-18 09:59:17,382 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.09 09:59:17 BoogieIcfgContainer [2018-09-18 09:59:17,382 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-18 09:59:17,383 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-18 09:59:17,383 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-18 09:59:17,387 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-18 09:59:17,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.09 09:59:16" (1/3) ... [2018-09-18 09:59:17,388 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f2c215d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.09 09:59:17, skipping insertion in model container [2018-09-18 09:59:17,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:59:17" (2/3) ... [2018-09-18 09:59:17,388 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f2c215d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.09 09:59:17, skipping insertion in model container [2018-09-18 09:59:17,388 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.09 09:59:17" (3/3) ... [2018-09-18 09:59:17,390 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_true-unreach-call1.i [2018-09-18 09:59:17,399 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-18 09:59:17,405 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-18 09:59:17,448 INFO L130 ementStrategyFactory]: Using default assertion order modulation [2018-09-18 09:59:17,449 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-18 09:59:17,449 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-18 09:59:17,449 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-18 09:59:17,449 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-18 09:59:17,449 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-18 09:59:17,449 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-18 09:59:17,449 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-18 09:59:17,449 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-18 09:59:17,465 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-09-18 09:59:17,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-18 09:59:17,471 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:17,472 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:17,473 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:17,477 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-09-18 09:59:17,480 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:17,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:17,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:59:17,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:17,524 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:17,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:17,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:17,584 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-18 09:59:17,584 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-18 09:59:17,584 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-18 09:59:17,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-09-18 09:59:17,600 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-09-18 09:59:17,600 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-18 09:59:17,602 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-09-18 09:59:17,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:17,624 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-09-18 09:59:17,624 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-09-18 09:59:17,625 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-09-18 09:59:17,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:17,634 INFO L225 Difference]: With dead ends: 29 [2018-09-18 09:59:17,634 INFO L226 Difference]: Without dead ends: 12 [2018-09-18 09:59:17,638 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 [2018-09-18 09:59:17,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-09-18 09:59:17,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-09-18 09:59:17,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-09-18 09:59:17,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-09-18 09:59:17,673 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-09-18 09:59:17,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:17,673 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-09-18 09:59:17,673 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-09-18 09:59:17,673 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-09-18 09:59:17,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-18 09:59:17,674 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:17,674 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:17,674 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:17,675 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-09-18 09:59:17,675 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:17,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:17,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:59:17,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:17,677 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:17,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:17,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:17,778 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-18 09:59:17,779 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-18 09:59:17,779 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-18 09:59:17,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-18 09:59:17,781 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-18 09:59:17,781 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-18 09:59:17,782 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-09-18 09:59:17,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:17,829 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-18 09:59:17,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-18 09:59:17,830 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-09-18 09:59:17,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:17,831 INFO L225 Difference]: With dead ends: 19 [2018-09-18 09:59:17,831 INFO L226 Difference]: Without dead ends: 14 [2018-09-18 09:59:17,832 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 [2018-09-18 09:59:17,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-09-18 09:59:17,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-09-18 09:59:17,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-09-18 09:59:17,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-09-18 09:59:17,837 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-09-18 09:59:17,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:17,837 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-09-18 09:59:17,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-18 09:59:17,838 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-09-18 09:59:17,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-09-18 09:59:17,838 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:17,838 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:17,839 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:17,839 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-09-18 09:59:17,839 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:17,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:17,840 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:59:17,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:17,841 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:17,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:18,043 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,044 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:18,044 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 [2018-09-18 09:59:18,060 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:59:18,061 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:59:18,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:18,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:18,139 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:18,232 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,252 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:18,252 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 [2018-09-18 09:59:18,270 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:59:18,270 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:59:18,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:18,288 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:18,314 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,314 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:18,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,329 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:18,329 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-09-18 09:59:18,330 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:18,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-18 09:59:18,330 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-18 09:59:18,331 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:59:18,331 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-09-18 09:59:18,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:18,380 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-18 09:59:18,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-18 09:59:18,381 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-09-18 09:59:18,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:18,382 INFO L225 Difference]: With dead ends: 21 [2018-09-18 09:59:18,382 INFO L226 Difference]: Without dead ends: 16 [2018-09-18 09:59:18,383 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:59:18,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-18 09:59:18,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-09-18 09:59:18,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-09-18 09:59:18,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-09-18 09:59:18,388 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-09-18 09:59:18,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:18,388 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-09-18 09:59:18,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-18 09:59:18,388 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-09-18 09:59:18,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-09-18 09:59:18,389 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:18,389 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:18,390 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:18,390 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-09-18 09:59:18,390 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:18,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:18,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:59:18,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:18,392 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:18,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:18,615 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,615 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:18,616 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 [2018-09-18 09:59:18,630 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:59:18,631 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:59:18,665 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:59:18,665 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:18,669 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:18,733 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,733 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:18,891 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,912 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:18,912 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 [2018-09-18 09:59:18,928 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:59:18,928 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:59:18,946 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:59:18,947 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:18,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:18,977 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,977 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:18,989 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:18,992 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:18,992 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-09-18 09:59:18,993 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:18,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-18 09:59:18,993 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-18 09:59:18,994 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-18 09:59:18,994 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-09-18 09:59:19,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:19,042 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-18 09:59:19,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-18 09:59:19,043 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-09-18 09:59:19,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:19,044 INFO L225 Difference]: With dead ends: 23 [2018-09-18 09:59:19,044 INFO L226 Difference]: Without dead ends: 18 [2018-09-18 09:59:19,045 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-18 09:59:19,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-09-18 09:59:19,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-09-18 09:59:19,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-18 09:59:19,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-09-18 09:59:19,052 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-09-18 09:59:19,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:19,053 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-09-18 09:59:19,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-18 09:59:19,053 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-09-18 09:59:19,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-18 09:59:19,053 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:19,054 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:19,054 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:19,054 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-09-18 09:59:19,054 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:19,055 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:19,055 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:19,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:19,056 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:19,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:19,189 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:19,189 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:19,190 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 [2018-09-18 09:59:19,204 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:59:19,204 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:59:19,219 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-18 09:59:19,220 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:19,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:19,232 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:19,233 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:19,400 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:19,421 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:19,421 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 [2018-09-18 09:59:19,437 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:59:19,438 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:59:19,475 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-18 09:59:19,475 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:19,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:19,540 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:19,541 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:19,564 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:19,569 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:19,569 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-09-18 09:59:19,569 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:19,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-18 09:59:19,570 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-18 09:59:19,570 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-18 09:59:19,570 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-09-18 09:59:19,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:19,654 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-18 09:59:19,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-18 09:59:19,655 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-09-18 09:59:19,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:19,656 INFO L225 Difference]: With dead ends: 25 [2018-09-18 09:59:19,656 INFO L226 Difference]: Without dead ends: 20 [2018-09-18 09:59:19,657 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-18 09:59:19,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-09-18 09:59:19,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-09-18 09:59:19,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-09-18 09:59:19,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-09-18 09:59:19,666 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-09-18 09:59:19,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:19,666 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-09-18 09:59:19,667 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-18 09:59:19,667 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-09-18 09:59:19,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-09-18 09:59:19,668 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:19,668 INFO L376 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:19,668 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:19,668 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-09-18 09:59:19,668 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:19,669 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:19,669 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:19,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:19,670 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:19,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:19,861 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:19,861 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:19,861 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 [2018-09-18 09:59:19,876 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:59:19,877 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:59:19,911 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:59:19,912 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:19,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:19,984 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:19,984 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:20,260 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:20,282 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:20,282 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 [2018-09-18 09:59:20,298 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:59:20,299 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:59:20,319 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:59:20,319 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:20,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:20,337 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:20,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:20,350 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:20,352 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:20,353 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-09-18 09:59:20,353 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:20,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-18 09:59:20,354 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-18 09:59:20,355 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-18 09:59:20,355 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-09-18 09:59:20,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:20,434 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-18 09:59:20,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-18 09:59:20,435 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-09-18 09:59:20,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:20,435 INFO L225 Difference]: With dead ends: 27 [2018-09-18 09:59:20,436 INFO L226 Difference]: Without dead ends: 22 [2018-09-18 09:59:20,436 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-18 09:59:20,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-09-18 09:59:20,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-09-18 09:59:20,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-09-18 09:59:20,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-09-18 09:59:20,441 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-09-18 09:59:20,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:20,441 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-09-18 09:59:20,441 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-18 09:59:20,441 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-09-18 09:59:20,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-18 09:59:20,442 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:20,442 INFO L376 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:20,442 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:20,443 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-09-18 09:59:20,443 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:20,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:20,444 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:20,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:20,444 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:20,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:20,631 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:20,631 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:20,631 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 [2018-09-18 09:59:20,643 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:59:20,643 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:59:20,700 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-18 09:59:20,701 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:20,705 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:20,728 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:20,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:20,977 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:21,005 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:21,005 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 [2018-09-18 09:59:21,021 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:59:21,021 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:59:21,060 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-18 09:59:21,060 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:21,063 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:21,085 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:21,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:21,093 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:21,095 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:21,096 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-09-18 09:59:21,096 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:21,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-18 09:59:21,096 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-18 09:59:21,097 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-18 09:59:21,097 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-09-18 09:59:21,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:21,194 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-18 09:59:21,196 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-18 09:59:21,197 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-09-18 09:59:21,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:21,198 INFO L225 Difference]: With dead ends: 29 [2018-09-18 09:59:21,198 INFO L226 Difference]: Without dead ends: 24 [2018-09-18 09:59:21,198 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-18 09:59:21,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-18 09:59:21,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-09-18 09:59:21,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-09-18 09:59:21,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-09-18 09:59:21,203 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-09-18 09:59:21,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:21,203 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-09-18 09:59:21,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-18 09:59:21,204 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-09-18 09:59:21,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-18 09:59:21,204 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:21,205 INFO L376 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:21,205 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:21,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-09-18 09:59:21,205 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:21,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:21,207 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:21,207 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:21,207 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:21,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:21,544 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:21,544 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:21,544 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 [2018-09-18 09:59:21,558 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:59:21,558 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:59:21,579 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-18 09:59:21,580 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:21,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:21,616 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:21,616 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:21,990 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:22,010 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:22,011 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 [2018-09-18 09:59:22,026 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:59:22,026 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:59:22,086 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-18 09:59:22,086 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:22,090 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:22,108 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:22,108 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:22,120 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:22,122 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:22,123 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-09-18 09:59:22,123 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:22,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-18 09:59:22,124 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-18 09:59:22,124 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-18 09:59:22,124 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-09-18 09:59:22,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:22,207 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-18 09:59:22,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-18 09:59:22,209 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-09-18 09:59:22,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:22,210 INFO L225 Difference]: With dead ends: 31 [2018-09-18 09:59:22,210 INFO L226 Difference]: Without dead ends: 26 [2018-09-18 09:59:22,211 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-18 09:59:22,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-18 09:59:22,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-18 09:59:22,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-18 09:59:22,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-09-18 09:59:22,216 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-09-18 09:59:22,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:22,216 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-09-18 09:59:22,217 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-18 09:59:22,217 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-09-18 09:59:22,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-09-18 09:59:22,218 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:22,218 INFO L376 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:22,218 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:22,219 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-09-18 09:59:22,219 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:22,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:22,220 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:22,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:22,220 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:22,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:22,503 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:22,504 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:22,504 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 [2018-09-18 09:59:22,511 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:59:22,512 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:59:22,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:22,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:22,535 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:22,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:22,917 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:22,937 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:22,937 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 [2018-09-18 09:59:22,954 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:59:22,954 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:59:22,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:22,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:23,002 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:23,003 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:23,013 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:23,014 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:23,015 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-09-18 09:59:23,015 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:23,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-18 09:59:23,016 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-18 09:59:23,016 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-18 09:59:23,017 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-09-18 09:59:23,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:23,102 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-18 09:59:23,108 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-18 09:59:23,109 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-09-18 09:59:23,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:23,109 INFO L225 Difference]: With dead ends: 33 [2018-09-18 09:59:23,110 INFO L226 Difference]: Without dead ends: 28 [2018-09-18 09:59:23,110 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-18 09:59:23,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-09-18 09:59:23,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-09-18 09:59:23,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-09-18 09:59:23,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-09-18 09:59:23,114 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-09-18 09:59:23,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:23,115 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-09-18 09:59:23,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-18 09:59:23,115 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-09-18 09:59:23,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-09-18 09:59:23,116 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:23,116 INFO L376 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:23,117 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:23,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-09-18 09:59:23,117 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:23,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:23,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:59:23,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:23,118 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:23,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:23,340 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:23,340 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:23,341 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 [2018-09-18 09:59:23,349 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:59:23,349 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:59:23,360 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:59:23,360 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:23,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:23,389 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:23,389 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:23,668 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:23,689 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:23,689 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 [2018-09-18 09:59:23,705 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:59:23,705 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:59:23,729 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:59:23,729 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:23,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:23,765 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:23,766 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:23,828 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:23,833 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:23,833 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-09-18 09:59:23,833 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:23,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-18 09:59:23,834 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-18 09:59:23,834 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-18 09:59:23,835 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-09-18 09:59:24,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:24,272 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-18 09:59:24,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-18 09:59:24,274 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-09-18 09:59:24,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:24,275 INFO L225 Difference]: With dead ends: 35 [2018-09-18 09:59:24,275 INFO L226 Difference]: Without dead ends: 30 [2018-09-18 09:59:24,276 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-18 09:59:24,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-18 09:59:24,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-09-18 09:59:24,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-09-18 09:59:24,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-09-18 09:59:24,281 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-09-18 09:59:24,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:24,282 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-09-18 09:59:24,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-18 09:59:24,282 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-09-18 09:59:24,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-18 09:59:24,283 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:24,283 INFO L376 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:24,283 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:24,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-09-18 09:59:24,284 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:24,284 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:24,285 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:24,285 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:24,285 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:24,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:24,454 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:24,454 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:24,454 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 [2018-09-18 09:59:24,463 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:59:24,463 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:59:24,545 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-18 09:59:24,546 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:24,548 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:24,563 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:24,563 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:24,990 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:25,010 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:25,010 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 [2018-09-18 09:59:25,026 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:59:25,027 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:59:25,131 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-18 09:59:25,131 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:25,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:25,150 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:25,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:25,179 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (19)] Exception during sending of exit command (exit): Broken pipe [2018-09-18 09:59:25,181 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:25,182 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-09-18 09:59:25,182 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:25,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-18 09:59:25,183 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-18 09:59:25,183 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-18 09:59:25,183 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-09-18 09:59:25,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:25,370 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-18 09:59:25,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-18 09:59:25,372 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-09-18 09:59:25,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:25,373 INFO L225 Difference]: With dead ends: 37 [2018-09-18 09:59:25,373 INFO L226 Difference]: Without dead ends: 32 [2018-09-18 09:59:25,374 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 104 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-18 09:59:25,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-09-18 09:59:25,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-09-18 09:59:25,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-18 09:59:25,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-09-18 09:59:25,379 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-09-18 09:59:25,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:25,379 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-09-18 09:59:25,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-18 09:59:25,379 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-09-18 09:59:25,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-09-18 09:59:25,380 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:25,380 INFO L376 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:25,380 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:25,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-09-18 09:59:25,381 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:25,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:25,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:25,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:25,382 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:25,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:25,609 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:25,609 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:25,609 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 [2018-09-18 09:59:25,620 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:59:25,620 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:59:25,632 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:59:25,632 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:25,635 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:25,653 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:25,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:26,157 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:26,177 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:26,178 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 [2018-09-18 09:59:26,194 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:59:26,195 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:59:26,218 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:59:26,218 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:26,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:26,248 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:26,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:26,285 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:26,286 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:26,287 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-09-18 09:59:26,287 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:26,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-18 09:59:26,287 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-18 09:59:26,288 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-18 09:59:26,288 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-09-18 09:59:26,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:26,447 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-18 09:59:26,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-18 09:59:26,447 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-09-18 09:59:26,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:26,449 INFO L225 Difference]: With dead ends: 39 [2018-09-18 09:59:26,449 INFO L226 Difference]: Without dead ends: 34 [2018-09-18 09:59:26,450 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-18 09:59:26,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-09-18 09:59:26,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-09-18 09:59:26,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-09-18 09:59:26,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-09-18 09:59:26,455 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-09-18 09:59:26,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:26,455 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-09-18 09:59:26,455 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-18 09:59:26,456 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-09-18 09:59:26,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-09-18 09:59:26,456 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:26,457 INFO L376 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:26,457 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:26,457 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-09-18 09:59:26,457 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:26,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:26,458 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:26,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:26,458 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:26,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:26,747 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:26,747 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:26,747 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 [2018-09-18 09:59:26,754 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:59:26,754 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 10:00:27,058 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-18 10:00:27,059 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:00:27,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:00:27,600 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:27,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:00:28,109 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:28,132 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:00:28,132 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 [2018-09-18 10:00:28,147 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 10:00:28,147 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 10:00:28,289 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-18 10:00:28,289 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:00:28,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:00:28,355 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:28,355 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:00:28,405 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:28,406 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 10:00:28,407 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-09-18 10:00:28,407 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 10:00:28,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-18 10:00:28,407 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-18 10:00:28,408 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-18 10:00:28,408 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-09-18 10:00:28,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 10:00:28,602 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-18 10:00:28,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-18 10:00:28,604 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-09-18 10:00:28,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 10:00:28,605 INFO L225 Difference]: With dead ends: 41 [2018-09-18 10:00:28,605 INFO L226 Difference]: Without dead ends: 36 [2018-09-18 10:00:28,606 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-18 10:00:28,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-09-18 10:00:28,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-09-18 10:00:28,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-09-18 10:00:28,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-09-18 10:00:28,614 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-09-18 10:00:28,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 10:00:28,615 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-09-18 10:00:28,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-18 10:00:28,615 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-09-18 10:00:28,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-09-18 10:00:28,618 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 10:00:28,618 INFO L376 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 10:00:28,618 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 10:00:28,618 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-09-18 10:00:28,618 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 10:00:28,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:00:28,619 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 10:00:28,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:00:28,620 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 10:00:28,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:00:28,925 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:00:28,925 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:00:28,925 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 [2018-09-18 10:00:28,932 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 10:00:28,933 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 10:01:39,553 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-18 10:01:39,553 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:40,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:40,206 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:40,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:40,675 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:40,697 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:40,697 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 [2018-09-18 10:01:40,712 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 10:01:40,713 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 10:01:40,889 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-18 10:01:40,889 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:40,892 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:40,923 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:40,924 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:40,979 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:40,981 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 10:01:40,981 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-09-18 10:01:40,981 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 10:01:40,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-18 10:01:40,982 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-18 10:01:40,982 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-18 10:01:40,982 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-09-18 10:01:41,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 10:01:41,124 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-18 10:01:41,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-18 10:01:41,124 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-09-18 10:01:41,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 10:01:41,125 INFO L225 Difference]: With dead ends: 43 [2018-09-18 10:01:41,125 INFO L226 Difference]: Without dead ends: 38 [2018-09-18 10:01:41,126 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 125 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-18 10:01:41,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-09-18 10:01:41,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-09-18 10:01:41,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-09-18 10:01:41,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-09-18 10:01:41,131 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-09-18 10:01:41,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 10:01:41,131 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-09-18 10:01:41,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-18 10:01:41,131 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-09-18 10:01:41,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-09-18 10:01:41,132 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 10:01:41,132 INFO L376 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 10:01:41,133 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 10:01:41,133 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-09-18 10:01:41,133 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 10:01:41,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:41,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 10:01:41,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:41,134 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 10:01:41,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:01:41,573 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:41,574 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:41,574 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 [2018-09-18 10:01:41,582 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 10:01:41,582 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 10:01:41,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:01:41,596 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:41,610 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:41,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:42,549 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:42,569 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:42,569 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 [2018-09-18 10:01:42,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 10:01:42,586 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 10:01:42,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:01:42,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:42,626 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:42,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:42,646 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:42,648 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 10:01:42,648 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-09-18 10:01:42,648 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 10:01:42,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-18 10:01:42,649 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-18 10:01:42,649 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-18 10:01:42,649 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-09-18 10:01:42,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 10:01:42,809 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-18 10:01:42,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-18 10:01:42,810 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-09-18 10:01:42,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 10:01:42,811 INFO L225 Difference]: With dead ends: 45 [2018-09-18 10:01:42,811 INFO L226 Difference]: Without dead ends: 40 [2018-09-18 10:01:42,812 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-18 10:01:42,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-09-18 10:01:42,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-09-18 10:01:42,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-09-18 10:01:42,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-09-18 10:01:42,818 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-09-18 10:01:42,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 10:01:42,818 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-09-18 10:01:42,818 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-18 10:01:42,818 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-09-18 10:01:42,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-09-18 10:01:42,819 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 10:01:42,819 INFO L376 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 10:01:42,820 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 10:01:42,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-09-18 10:01:42,820 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 10:01:42,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:42,821 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 10:01:42,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:42,821 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 10:01:42,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:01:43,958 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:43,958 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:43,958 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 [2018-09-18 10:01:43,966 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 10:01:43,967 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 10:01:43,980 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 10:01:43,980 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:43,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:44,002 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:44,002 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:44,637 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:44,659 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:44,659 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 [2018-09-18 10:01:44,675 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 10:01:44,675 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 10:01:44,708 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 10:01:44,708 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:44,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:44,731 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:44,732 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:44,743 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:44,744 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 10:01:44,745 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-09-18 10:01:44,745 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 10:01:44,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-18 10:01:44,745 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-18 10:01:44,746 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-09-18 10:01:44,746 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-09-18 10:01:44,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 10:01:44,967 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-18 10:01:44,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-18 10:01:44,968 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-09-18 10:01:44,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 10:01:44,969 INFO L225 Difference]: With dead ends: 47 [2018-09-18 10:01:44,969 INFO L226 Difference]: Without dead ends: 42 [2018-09-18 10:01:44,970 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-09-18 10:01:44,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-09-18 10:01:44,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-09-18 10:01:44,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-09-18 10:01:44,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-09-18 10:01:44,976 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-09-18 10:01:44,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 10:01:44,977 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-09-18 10:01:44,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-18 10:01:44,977 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-09-18 10:01:44,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-09-18 10:01:44,978 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 10:01:44,978 INFO L376 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 10:01:44,978 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 10:01:44,978 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-09-18 10:01:44,978 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 10:01:44,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:44,979 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 10:01:44,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:44,979 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 10:01:44,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:01:45,325 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:45,325 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:45,325 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 [2018-09-18 10:01:45,335 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 10:01:45,335 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 10:01:48,339 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-18 10:01:48,340 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:48,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:48,394 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:48,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:49,317 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:49,338 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:49,338 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 [2018-09-18 10:01:49,353 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 10:01:49,353 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 10:01:49,589 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-18 10:01:49,589 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:49,592 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:49,620 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:49,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:49,635 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:49,636 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 10:01:49,636 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-09-18 10:01:49,637 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 10:01:49,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-18 10:01:49,637 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-18 10:01:49,637 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-09-18 10:01:49,638 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-09-18 10:01:49,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 10:01:49,874 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-18 10:01:49,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-18 10:01:49,874 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-09-18 10:01:49,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 10:01:49,875 INFO L225 Difference]: With dead ends: 49 [2018-09-18 10:01:49,875 INFO L226 Difference]: Without dead ends: 44 [2018-09-18 10:01:49,876 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 146 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-09-18 10:01:49,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-09-18 10:01:49,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-09-18 10:01:49,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-09-18 10:01:49,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-09-18 10:01:49,880 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-09-18 10:01:49,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 10:01:49,881 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-09-18 10:01:49,881 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-18 10:01:49,881 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-09-18 10:01:49,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-09-18 10:01:49,882 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 10:01:49,882 INFO L376 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 10:01:49,882 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 10:01:49,882 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-09-18 10:01:49,883 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 10:01:49,883 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:49,884 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 10:01:49,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:49,884 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 10:01:49,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:01:50,244 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:50,245 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:50,245 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 [2018-09-18 10:01:50,254 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 10:01:50,254 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 10:01:50,268 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 10:01:50,268 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:50,269 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:50,303 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:50,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:51,102 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:51,122 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:51,122 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 [2018-09-18 10:01:51,138 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 10:01:51,138 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 10:01:51,170 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 10:01:51,170 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 10:01:51,175 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 10:01:51,251 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:51,251 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 10:01:51,266 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:51,268 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 10:01:51,268 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-09-18 10:01:51,268 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 10:01:51,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-18 10:01:51,269 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-18 10:01:51,269 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-09-18 10:01:51,269 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-09-18 10:01:51,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 10:01:51,496 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-18 10:01:51,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-18 10:01:51,496 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-09-18 10:01:51,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 10:01:51,497 INFO L225 Difference]: With dead ends: 51 [2018-09-18 10:01:51,497 INFO L226 Difference]: Without dead ends: 46 [2018-09-18 10:01:51,498 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 153 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-09-18 10:01:51,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-09-18 10:01:51,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-09-18 10:01:51,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-09-18 10:01:51,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-09-18 10:01:51,503 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-09-18 10:01:51,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 10:01:51,503 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-09-18 10:01:51,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-18 10:01:51,504 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-09-18 10:01:51,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-09-18 10:01:51,504 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 10:01:51,505 INFO L376 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 10:01:51,505 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 10:01:51,505 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-09-18 10:01:51,505 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 10:01:51,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:51,506 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 10:01:51,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 10:01:51,506 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 10:01:51,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 10:01:52,186 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 10:01:52,186 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 10:01:52,186 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 [2018-09-18 10:01:52,193 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 10:01:52,194 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