java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/half_2_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:06:37,687 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:06:37,689 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:06:37,712 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:06:37,712 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:06:37,713 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:06:37,714 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:06:37,716 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:06:37,718 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:06:37,719 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:06:37,720 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:06:37,720 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:06:37,721 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:06:37,723 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:06:37,727 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:06:37,728 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:06:37,728 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:06:37,732 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:06:37,735 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:06:37,739 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:06:37,745 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:06:37,746 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:06:37,752 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 16:06:37,752 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 16:06:37,753 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 16:06:37,754 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 16:06:37,755 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 16:06:37,758 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 16:06:37,758 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 16:06:37,759 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 16:06:37,762 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 16:06:37,763 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-22 16:06:37,763 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-22 16:06:37,763 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-22 16:06:37,764 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-22 16:06:37,765 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-22 16:06:37,767 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:06:37,796 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:06:37,797 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:06:37,797 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:06:37,798 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:06:37,799 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:06:37,799 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:06:37,799 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:06:37,799 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:06:37,799 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:06:37,800 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:06:37,800 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:06:37,800 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:06:37,801 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:06:37,801 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:06:37,802 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:06:37,802 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:06:37,802 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:06:37,802 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:06:37,802 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:06:37,803 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:06:37,803 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:06:37,803 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:06:37,803 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:06:37,803 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:06:37,804 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:06:37,804 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:06:37,804 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:06:37,804 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:06:37,804 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:06:37,805 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:06:37,807 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:06:37,807 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:06:37,807 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:06:37,808 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:06:37,877 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:06:37,894 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:06:37,898 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:06:37,900 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:06:37,901 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:06:37,902 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/half_2_true-unreach-call_true-termination.i [2018-10-22 16:06:37,975 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e6cfbc2be/3c38a4c4520b40fdbe53b8dae750dcf2/FLAGf75a4aa6f [2018-10-22 16:06:38,454 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:06:38,455 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/half_2_true-unreach-call_true-termination.i [2018-10-22 16:06:38,461 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e6cfbc2be/3c38a4c4520b40fdbe53b8dae750dcf2/FLAGf75a4aa6f [2018-10-22 16:06:38,475 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/e6cfbc2be/3c38a4c4520b40fdbe53b8dae750dcf2 [2018-10-22 16:06:38,486 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:06:38,488 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:06:38,489 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:06:38,489 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:06:38,493 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:06:38,494 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,497 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ab32887 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38, skipping insertion in model container [2018-10-22 16:06:38,497 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,508 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:06:38,529 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:06:38,709 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:06:38,713 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:06:38,733 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:06:38,750 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:06:38,750 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38 WrapperNode [2018-10-22 16:06:38,751 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:06:38,752 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:06:38,752 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:06:38,752 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:06:38,763 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,769 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,776 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:06:38,777 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:06:38,777 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:06:38,777 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:06:38,788 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,789 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,790 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,790 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,794 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,800 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,801 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... [2018-10-22 16:06:38,803 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:06:38,804 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:06:38,804 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:06:38,804 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:06:38,805 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:06:38,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:06:38,965 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:06:38,965 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:06:38,965 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:06:38,966 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:06:38,966 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:06:38,966 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:06:38,967 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:06:39,352 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:06:39,352 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:06:39 BoogieIcfgContainer [2018-10-22 16:06:39,353 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:06:39,354 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:06:39,354 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:06:39,357 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:06:39,357 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:06:38" (1/3) ... [2018-10-22 16:06:39,358 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c78ab8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:06:39, skipping insertion in model container [2018-10-22 16:06:39,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:06:38" (2/3) ... [2018-10-22 16:06:39,359 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c78ab8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:06:39, skipping insertion in model container [2018-10-22 16:06:39,359 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:06:39" (3/3) ... [2018-10-22 16:06:39,361 INFO L112 eAbstractionObserver]: Analyzing ICFG half_2_true-unreach-call_true-termination.i [2018-10-22 16:06:39,371 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:06:39,381 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:06:39,399 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:06:39,441 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:06:39,442 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:06:39,443 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:06:39,443 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:06:39,443 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:06:39,443 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:06:39,443 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:06:39,444 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:06:39,444 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:06:39,464 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2018-10-22 16:06:39,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-22 16:06:39,471 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:39,472 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:39,475 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:39,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:39,481 INFO L82 PathProgramCache]: Analyzing trace with hash 123572206, now seen corresponding path program 1 times [2018-10-22 16:06:39,484 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:39,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:39,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:39,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:39,530 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:39,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:39,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:39,592 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:06:39,592 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:06:39,593 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:06:39,596 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:06:39,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:06:39,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:06:39,611 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 2 states. [2018-10-22 16:06:39,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:39,637 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2018-10-22 16:06:39,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:06:39,639 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 14 [2018-10-22 16:06:39,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:39,648 INFO L225 Difference]: With dead ends: 40 [2018-10-22 16:06:39,649 INFO L226 Difference]: Without dead ends: 19 [2018-10-22 16:06:39,652 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:06:39,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-22 16:06:39,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-22 16:06:39,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 16:06:39,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-10-22 16:06:39,692 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-10-22 16:06:39,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:39,693 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-10-22 16:06:39,693 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:06:39,693 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-10-22 16:06:39,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 16:06:39,694 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:39,695 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:39,695 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:39,696 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:39,696 INFO L82 PathProgramCache]: Analyzing trace with hash -204041864, now seen corresponding path program 1 times [2018-10-22 16:06:39,696 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:39,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:39,698 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:39,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:39,698 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:39,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:39,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:39,931 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:06:39,931 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-22 16:06:39,931 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:06:39,933 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 16:06:39,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 16:06:39,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 16:06:39,934 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2018-10-22 16:06:40,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:40,121 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-10-22 16:06:40,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:06:40,122 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-22 16:06:40,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:40,123 INFO L225 Difference]: With dead ends: 34 [2018-10-22 16:06:40,123 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 16:06:40,124 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-22 16:06:40,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 16:06:40,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-22 16:06:40,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-22 16:06:40,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-22 16:06:40,131 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-10-22 16:06:40,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:40,131 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-22 16:06:40,131 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 16:06:40,132 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-22 16:06:40,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 16:06:40,132 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:40,133 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:40,133 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:40,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:40,133 INFO L82 PathProgramCache]: Analyzing trace with hash 615296882, now seen corresponding path program 1 times [2018-10-22 16:06:40,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:40,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:40,135 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:40,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:40,135 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:40,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:40,521 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:40,521 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:40,521 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:40,522 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2018-10-22 16:06:40,524 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [18], [22], [26], [32], [40], [43], [45], [51], [52], [53], [55] [2018-10-22 16:06:40,573 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:06:40,574 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:06:40,757 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:06:41,090 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:06:41,095 INFO L272 AbstractInterpreter]: Visited 16 different actions 116 times. Merged at 6 different actions 60 times. Widened at 2 different actions 12 times. Found 1 fixpoints after 1 different actions. Largest state had 6 variables. [2018-10-22 16:06:41,141 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:41,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:06:41,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:41,143 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:41,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:41,160 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:06:41,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:41,196 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:41,436 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:41,437 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:41,809 WARN L179 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2018-10-22 16:06:41,943 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:41,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:41,976 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:06:42,001 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:42,002 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:06:42,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:42,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:42,149 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:42,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:42,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:42,199 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:42,200 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-10-22 16:06:42,201 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:42,201 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:06:42,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:06:42,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:06:42,206 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2018-10-22 16:06:42,624 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-10-22 16:06:42,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:42,912 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2018-10-22 16:06:42,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:06:42,912 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2018-10-22 16:06:42,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:42,913 INFO L225 Difference]: With dead ends: 38 [2018-10-22 16:06:42,913 INFO L226 Difference]: Without dead ends: 23 [2018-10-22 16:06:42,915 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 56 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:06:42,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-22 16:06:42,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-22 16:06:42,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-22 16:06:42,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-10-22 16:06:42,921 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 17 [2018-10-22 16:06:42,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:42,921 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-10-22 16:06:42,921 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:06:42,921 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-10-22 16:06:42,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 16:06:42,922 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:42,922 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:42,923 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:42,923 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:42,923 INFO L82 PathProgramCache]: Analyzing trace with hash 2020816620, now seen corresponding path program 2 times [2018-10-22 16:06:42,923 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:42,924 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:42,924 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:42,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:42,925 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:42,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:43,021 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:43,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:43,022 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:43,022 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:43,022 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:43,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:43,023 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:43,033 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:06:43,033 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:43,050 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:06:43,050 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:43,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:43,127 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:43,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:43,243 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:43,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:43,263 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:06:43,281 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:06:43,281 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:43,303 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:06:43,303 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:43,307 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:43,326 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:43,326 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:43,356 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:43,358 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:43,358 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 13 [2018-10-22 16:06:43,358 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:43,359 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:06:43,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:06:43,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2018-10-22 16:06:43,360 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 9 states. [2018-10-22 16:06:43,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:43,542 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2018-10-22 16:06:43,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:06:43,543 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2018-10-22 16:06:43,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:43,546 INFO L225 Difference]: With dead ends: 37 [2018-10-22 16:06:43,546 INFO L226 Difference]: Without dead ends: 35 [2018-10-22 16:06:43,549 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:06:43,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-22 16:06:43,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2018-10-22 16:06:43,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 16:06:43,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-10-22 16:06:43,561 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 19 [2018-10-22 16:06:43,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:43,562 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-10-22 16:06:43,562 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:06:43,562 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-10-22 16:06:43,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-22 16:06:43,563 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:43,563 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:43,563 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:43,564 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:43,564 INFO L82 PathProgramCache]: Analyzing trace with hash 214509359, now seen corresponding path program 1 times [2018-10-22 16:06:43,564 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:43,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:43,565 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:43,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:43,566 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:43,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:44,024 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:44,025 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:44,025 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:44,025 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 28 with the following transitions: [2018-10-22 16:06:44,026 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [16], [18], [22], [26], [32], [34], [40], [43], [45], [48], [50], [51], [52], [53], [55], [56] [2018-10-22 16:06:44,028 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:06:44,029 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:06:44,054 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 16:06:44,451 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:06:44,451 INFO L272 AbstractInterpreter]: Visited 20 different actions 237 times. Merged at 8 different actions 101 times. Widened at 3 different actions 20 times. Found 11 fixpoints after 2 different actions. Largest state had 8 variables. [2018-10-22 16:06:44,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:44,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:06:44,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:44,489 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:44,502 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:44,502 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:06:44,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:44,531 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:44,874 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:44,874 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:45,384 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:45,404 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:45,405 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:06:45,420 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:45,421 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:06:45,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:45,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:45,803 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:45,804 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:45,985 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:45,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:45,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 11, 10] total 27 [2018-10-22 16:06:45,994 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:45,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:06:45,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:06:45,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=588, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:06:45,997 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 18 states. [2018-10-22 16:06:46,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:46,497 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2018-10-22 16:06:46,497 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:06:46,497 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 27 [2018-10-22 16:06:46,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:46,501 INFO L225 Difference]: With dead ends: 55 [2018-10-22 16:06:46,501 INFO L226 Difference]: Without dead ends: 32 [2018-10-22 16:06:46,502 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 84 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=169, Invalid=887, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:06:46,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-22 16:06:46,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-22 16:06:46,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 16:06:46,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2018-10-22 16:06:46,508 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 27 [2018-10-22 16:06:46,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:46,509 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2018-10-22 16:06:46,509 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:06:46,509 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2018-10-22 16:06:46,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 16:06:46,510 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:46,510 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:46,510 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:46,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:46,511 INFO L82 PathProgramCache]: Analyzing trace with hash 1884298793, now seen corresponding path program 2 times [2018-10-22 16:06:46,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:46,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:46,512 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:46,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:46,512 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:46,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:46,675 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:46,676 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:46,676 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:46,676 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:46,676 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:46,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:46,677 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:46,691 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:06:46,692 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:46,705 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:06:46,705 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:46,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:46,816 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:46,816 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:47,002 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:47,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:47,023 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:06:47,039 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:06:47,039 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:47,066 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:06:47,066 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:47,071 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:47,079 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:47,080 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:47,185 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:06:47,187 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:47,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9, 9, 9] total 18 [2018-10-22 16:06:47,188 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:47,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:06:47,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:06:47,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2018-10-22 16:06:47,189 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 15 states. [2018-10-22 16:06:47,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:47,606 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-10-22 16:06:47,606 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:06:47,607 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 29 [2018-10-22 16:06:47,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:47,608 INFO L225 Difference]: With dead ends: 47 [2018-10-22 16:06:47,609 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 16:06:47,609 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 104 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=107, Invalid=445, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:06:47,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 16:06:47,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2018-10-22 16:06:47,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-22 16:06:47,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-10-22 16:06:47,617 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 29 [2018-10-22 16:06:47,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:47,618 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-10-22 16:06:47,618 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:06:47,618 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-10-22 16:06:47,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-22 16:06:47,619 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:47,619 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:47,619 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:47,619 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:47,620 INFO L82 PathProgramCache]: Analyzing trace with hash 2099085676, now seen corresponding path program 3 times [2018-10-22 16:06:47,620 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:47,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:47,621 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:47,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:47,621 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:47,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:47,985 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:06:47,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:47,986 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:47,986 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:47,986 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:47,986 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:47,986 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:48,020 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:06:48,020 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:06:48,043 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:06:48,043 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:48,047 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:51,087 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:06:51,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:51,848 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:06:51,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:51,869 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:06:51,887 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:06:51,887 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:06:51,931 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 16:06:51,931 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:51,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:52,219 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:06:52,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:52,502 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:06:52,504 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:52,505 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 14, 12, 12] total 43 [2018-10-22 16:06:52,505 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:52,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:06:52,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:06:52,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=1583, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 16:06:52,506 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 24 states. [2018-10-22 16:06:53,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:53,187 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2018-10-22 16:06:53,187 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:06:53,187 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 37 [2018-10-22 16:06:53,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:53,189 INFO L225 Difference]: With dead ends: 65 [2018-10-22 16:06:53,189 INFO L226 Difference]: Without dead ends: 42 [2018-10-22 16:06:53,192 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 112 SyntacticMatches, 9 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 816 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=355, Invalid=2615, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:06:53,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-22 16:06:53,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-22 16:06:53,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-22 16:06:53,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-10-22 16:06:53,198 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 37 [2018-10-22 16:06:53,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:53,199 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-10-22 16:06:53,199 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:06:53,199 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-10-22 16:06:53,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-22 16:06:53,200 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:53,200 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:53,201 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:53,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:53,201 INFO L82 PathProgramCache]: Analyzing trace with hash -599816218, now seen corresponding path program 4 times [2018-10-22 16:06:53,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:53,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:53,202 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:53,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:53,202 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:53,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:53,348 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 15 proven. 22 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:06:53,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:53,349 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:53,349 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:53,349 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:53,349 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:53,349 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:53,357 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:06:53,357 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:06:53,398 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:06:53,398 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:53,401 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:53,535 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 34 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:06:53,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:53,680 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 34 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-22 16:06:53,700 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:53,701 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:06:53,716 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:06:53,716 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:06:53,752 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:06:53,753 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:53,757 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:53,764 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:06:53,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:53,839 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-22 16:06:53,840 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:53,841 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13, 11, 11] total 24 [2018-10-22 16:06:53,841 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:53,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:06:53,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:06:53,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:06:53,842 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 18 states. [2018-10-22 16:06:54,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:54,105 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-10-22 16:06:54,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:06:54,106 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-10-22 16:06:54,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:54,107 INFO L225 Difference]: With dead ends: 57 [2018-10-22 16:06:54,107 INFO L226 Difference]: Without dead ends: 55 [2018-10-22 16:06:54,108 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 136 SyntacticMatches, 10 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=175, Invalid=817, Unknown=0, NotChecked=0, Total=992 [2018-10-22 16:06:54,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-22 16:06:54,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2018-10-22 16:06:54,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-22 16:06:54,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2018-10-22 16:06:54,116 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 39 [2018-10-22 16:06:54,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:54,116 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2018-10-22 16:06:54,117 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:06:54,117 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2018-10-22 16:06:54,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-22 16:06:54,118 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:54,118 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:54,118 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:54,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:54,119 INFO L82 PathProgramCache]: Analyzing trace with hash 303685161, now seen corresponding path program 5 times [2018-10-22 16:06:54,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:54,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:54,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:54,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:54,120 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:54,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:54,567 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 17 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:06:54,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:54,567 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:54,568 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:54,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:54,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:54,568 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:54,583 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:06:54,583 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:54,663 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2018-10-22 16:06:54,663 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:54,666 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:55,157 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:06:55,157 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:55,770 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 11 proven. 42 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:06:55,792 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:55,792 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:06:55,808 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:06:55,808 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:06:55,863 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2018-10-22 16:06:55,864 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:55,869 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:56,123 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 6 proven. 41 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:06:56,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:56,268 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 6 proven. 41 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:06:56,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:56,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 15, 14] total 38 [2018-10-22 16:06:56,272 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:56,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 16:06:56,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 16:06:56,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1213, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:06:56,276 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 26 states. [2018-10-22 16:06:57,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:57,037 INFO L93 Difference]: Finished difference Result 97 states and 102 transitions. [2018-10-22 16:06:57,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-22 16:06:57,037 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 47 [2018-10-22 16:06:57,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:57,039 INFO L225 Difference]: With dead ends: 97 [2018-10-22 16:06:57,040 INFO L226 Difference]: Without dead ends: 62 [2018-10-22 16:06:57,042 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 156 SyntacticMatches, 12 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=288, Invalid=1782, Unknown=0, NotChecked=0, Total=2070 [2018-10-22 16:06:57,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-22 16:06:57,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2018-10-22 16:06:57,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-22 16:06:57,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-10-22 16:06:57,049 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 47 [2018-10-22 16:06:57,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:57,049 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-10-22 16:06:57,049 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 16:06:57,050 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-10-22 16:06:57,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-22 16:06:57,051 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:57,051 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:57,051 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:57,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:57,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1075211229, now seen corresponding path program 6 times [2018-10-22 16:06:57,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:57,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:57,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:57,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:57,053 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:57,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:57,276 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 25 proven. 38 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-22 16:06:57,276 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:57,276 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:57,276 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:57,277 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:57,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:57,277 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:57,285 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:06:57,285 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:06:57,353 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2018-10-22 16:06:57,353 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:57,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:57,506 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 6 proven. 51 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:06:57,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:58,042 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 6 proven. 51 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:06:58,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:58,062 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:06:58,077 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:06:58,078 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:06:58,142 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2018-10-22 16:06:58,142 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:06:58,146 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:58,156 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 6 proven. 51 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:06:58,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:06:58,286 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 6 proven. 51 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-22 16:06:58,288 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:06:58,288 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13, 13, 13] total 26 [2018-10-22 16:06:58,289 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:06:58,289 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:06:58,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:06:58,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=538, Unknown=0, NotChecked=0, Total=650 [2018-10-22 16:06:58,291 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 21 states. [2018-10-22 16:06:58,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:06:58,628 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2018-10-22 16:06:58,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:06:58,629 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2018-10-22 16:06:58,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:06:58,631 INFO L225 Difference]: With dead ends: 67 [2018-10-22 16:06:58,631 INFO L226 Difference]: Without dead ends: 65 [2018-10-22 16:06:58,632 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 176 SyntacticMatches, 10 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=234, Invalid=1026, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:06:58,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-10-22 16:06:58,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2018-10-22 16:06:58,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-22 16:06:58,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-10-22 16:06:58,642 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 49 [2018-10-22 16:06:58,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:06:58,642 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-10-22 16:06:58,643 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:06:58,643 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-10-22 16:06:58,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-22 16:06:58,644 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:06:58,644 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:06:58,644 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:06:58,644 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:06:58,645 INFO L82 PathProgramCache]: Analyzing trace with hash 893803878, now seen corresponding path program 7 times [2018-10-22 16:06:58,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:06:58,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:58,646 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:06:58,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:06:58,646 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:06:58,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:59,028 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 31 proven. 52 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:06:59,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:59,028 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:06:59,028 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:06:59,029 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:06:59,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:06:59,029 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:06:59,036 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:06:59,037 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:06:59,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:06:59,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:06:59,475 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 7 proven. 76 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:06:59,475 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:00,290 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 7 proven. 76 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:07:00,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:00,312 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:07:00,341 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:00,342 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:07:00,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:00,383 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:00,613 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 8 proven. 66 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:00,614 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:00,923 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 8 proven. 66 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:00,925 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:00,925 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 17, 16] total 45 [2018-10-22 16:07:00,925 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:00,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:07:00,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:07:00,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=1707, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:07:00,927 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 30 states. [2018-10-22 16:07:01,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:01,907 INFO L93 Difference]: Finished difference Result 115 states and 120 transitions. [2018-10-22 16:07:01,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:07:01,908 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 57 [2018-10-22 16:07:01,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:01,910 INFO L225 Difference]: With dead ends: 115 [2018-10-22 16:07:01,910 INFO L226 Difference]: Without dead ends: 72 [2018-10-22 16:07:01,912 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 192 SyntacticMatches, 11 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 953 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=397, Invalid=2465, Unknown=0, NotChecked=0, Total=2862 [2018-10-22 16:07:01,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-22 16:07:01,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2018-10-22 16:07:01,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-22 16:07:01,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2018-10-22 16:07:01,920 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 57 [2018-10-22 16:07:01,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:01,920 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2018-10-22 16:07:01,920 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:07:01,920 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2018-10-22 16:07:01,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-22 16:07:01,921 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:01,921 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:01,922 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:01,922 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:01,922 INFO L82 PathProgramCache]: Analyzing trace with hash 1175347936, now seen corresponding path program 8 times [2018-10-22 16:07:01,922 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:01,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:01,923 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:01,923 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:01,923 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:01,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:02,120 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 37 proven. 58 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-22 16:07:02,120 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:02,120 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:02,121 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:02,121 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:02,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:02,121 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:02,129 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:02,129 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:02,148 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:02,148 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:02,152 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:02,293 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 8 proven. 78 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:02,293 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:02,884 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 8 proven. 78 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:02,905 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:02,905 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:07:02,922 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:02,923 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:02,967 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:02,967 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:02,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:02,983 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 8 proven. 78 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:02,983 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:03,134 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 8 proven. 78 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-22 16:07:03,137 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:03,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15, 15, 15] total 30 [2018-10-22 16:07:03,137 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:03,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:07:03,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:07:03,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2018-10-22 16:07:03,139 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand 24 states. [2018-10-22 16:07:03,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:03,717 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-10-22 16:07:03,718 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:07:03,718 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-10-22 16:07:03,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:03,720 INFO L225 Difference]: With dead ends: 77 [2018-10-22 16:07:03,720 INFO L226 Difference]: Without dead ends: 75 [2018-10-22 16:07:03,721 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 212 SyntacticMatches, 12 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=317, Invalid=1405, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:07:03,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-10-22 16:07:03,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 70. [2018-10-22 16:07:03,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-22 16:07:03,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-10-22 16:07:03,730 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 59 [2018-10-22 16:07:03,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:03,730 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-10-22 16:07:03,730 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:07:03,731 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-10-22 16:07:03,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-22 16:07:03,732 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:03,732 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:03,732 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:03,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:03,733 INFO L82 PathProgramCache]: Analyzing trace with hash -549249245, now seen corresponding path program 9 times [2018-10-22 16:07:03,733 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:03,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:03,734 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:03,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:03,734 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:03,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:04,616 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 49 proven. 70 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:07:04,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:04,617 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:04,617 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:04,617 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:04,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:04,617 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:04,625 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:04,625 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:04,677 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-22 16:07:04,677 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:04,680 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:04,980 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 21 proven. 98 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:07:04,981 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:06,196 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 21 proven. 98 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:07:06,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:06,216 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:07:06,230 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:06,230 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:06,326 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-22 16:07:06,326 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:06,331 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:07,129 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 10 proven. 97 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:07,129 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:07,484 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 10 proven. 97 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:07,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:07,485 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 20, 18, 18] total 62 [2018-10-22 16:07:07,485 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:07,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 16:07:07,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 16:07:07,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=3304, Unknown=0, NotChecked=0, Total=3782 [2018-10-22 16:07:07,487 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 29 states. [2018-10-22 16:07:08,366 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 7 DAG size of output: 6 [2018-10-22 16:07:08,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:08,736 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2018-10-22 16:07:08,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:07:08,737 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 67 [2018-10-22 16:07:08,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:08,738 INFO L225 Difference]: With dead ends: 107 [2018-10-22 16:07:08,739 INFO L226 Difference]: Without dead ends: 72 [2018-10-22 16:07:08,741 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 218 SyntacticMatches, 10 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2026 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=599, Invalid=4371, Unknown=0, NotChecked=0, Total=4970 [2018-10-22 16:07:08,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-22 16:07:08,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-22 16:07:08,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-22 16:07:08,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-10-22 16:07:08,749 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 67 [2018-10-22 16:07:08,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:08,749 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-10-22 16:07:08,750 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 16:07:08,750 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-10-22 16:07:08,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-22 16:07:08,751 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:08,751 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:08,751 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:08,751 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:08,752 INFO L82 PathProgramCache]: Analyzing trace with hash 42341405, now seen corresponding path program 10 times [2018-10-22 16:07:08,752 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:08,752 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:08,752 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:08,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:08,753 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:08,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:08,990 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 51 proven. 82 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:07:08,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:08,990 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:08,990 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:08,990 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:08,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:08,991 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:09,000 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:09,000 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:09,049 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:09,049 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:09,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:09,243 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 9 proven. 124 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:07:09,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:09,495 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 9 proven. 124 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-22 16:07:09,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:09,516 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:07:09,531 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:09,531 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:09,589 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:09,589 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:09,594 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:09,605 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 10 proven. 111 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:09,605 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:09,699 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 10 proven. 111 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:07:09,701 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:09,701 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19, 17, 17] total 36 [2018-10-22 16:07:09,701 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:09,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:07:09,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:07:09,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1065, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:07:09,702 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 27 states. [2018-10-22 16:07:10,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:10,689 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2018-10-22 16:07:10,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:07:10,696 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2018-10-22 16:07:10,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:10,697 INFO L225 Difference]: With dead ends: 87 [2018-10-22 16:07:10,697 INFO L226 Difference]: Without dead ends: 85 [2018-10-22 16:07:10,698 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 244 SyntacticMatches, 16 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 912 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=424, Invalid=2026, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:07:10,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-10-22 16:07:10,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 80. [2018-10-22 16:07:10,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-22 16:07:10,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2018-10-22 16:07:10,705 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 69 [2018-10-22 16:07:10,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:10,705 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2018-10-22 16:07:10,705 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:07:10,705 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2018-10-22 16:07:10,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-10-22 16:07:10,706 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:10,706 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:10,706 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:10,706 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:10,707 INFO L82 PathProgramCache]: Analyzing trace with hash -641186976, now seen corresponding path program 11 times [2018-10-22 16:07:10,707 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:10,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:10,707 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:10,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:10,709 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:10,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:11,748 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 71 proven. 90 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:07:11,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:11,748 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:11,748 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:11,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:11,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:11,749 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:11,756 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:07:11,756 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:11,785 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2018-10-22 16:07:11,785 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:11,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:12,853 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 26 proven. 135 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:07:12,854 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:13,868 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 26 proven. 135 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:07:13,888 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:13,888 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:07:13,903 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:07:13,903 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:14,011 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2018-10-22 16:07:14,011 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:14,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:14,183 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 12 proven. 134 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:14,183 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:14,373 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 12 proven. 134 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:14,374 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:14,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 21, 20] total 56 [2018-10-22 16:07:14,374 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:14,375 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-22 16:07:14,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-22 16:07:14,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=2683, Unknown=0, NotChecked=0, Total=3080 [2018-10-22 16:07:14,376 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand 38 states. [2018-10-22 16:07:15,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:15,157 INFO L93 Difference]: Finished difference Result 151 states and 156 transitions. [2018-10-22 16:07:15,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-22 16:07:15,158 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 77 [2018-10-22 16:07:15,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:15,159 INFO L225 Difference]: With dead ends: 151 [2018-10-22 16:07:15,160 INFO L226 Difference]: Without dead ends: 92 [2018-10-22 16:07:15,163 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 263 SyntacticMatches, 13 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1544 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=576, Invalid=3846, Unknown=0, NotChecked=0, Total=4422 [2018-10-22 16:07:15,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-10-22 16:07:15,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 82. [2018-10-22 16:07:15,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-22 16:07:15,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-22 16:07:15,170 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2018-10-22 16:07:15,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:15,170 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-22 16:07:15,170 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-22 16:07:15,171 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-22 16:07:15,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-10-22 16:07:15,171 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:15,172 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:15,172 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:15,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:15,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1270822950, now seen corresponding path program 12 times [2018-10-22 16:07:15,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:15,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:15,173 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:15,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:15,173 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:15,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:15,692 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 67 proven. 110 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-22 16:07:15,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:15,692 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:15,692 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:15,692 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:15,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:15,692 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:15,700 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:07:15,700 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:07:15,730 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 16:07:15,730 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:15,733 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:15,920 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 12 proven. 150 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:15,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:16,195 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 12 proven. 150 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:16,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:16,215 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:07:16,230 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:07:16,230 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:07:16,354 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2018-10-22 16:07:16,354 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:16,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:16,370 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 12 proven. 150 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:16,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:16,477 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 12 proven. 150 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-22 16:07:16,479 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:16,479 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19, 19, 19] total 38 [2018-10-22 16:07:16,479 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:16,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:07:16,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:07:16,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=1174, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 16:07:16,481 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 30 states. [2018-10-22 16:07:17,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:17,170 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2018-10-22 16:07:17,170 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 16:07:17,170 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 79 [2018-10-22 16:07:17,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:17,172 INFO L225 Difference]: With dead ends: 97 [2018-10-22 16:07:17,172 INFO L226 Difference]: Without dead ends: 95 [2018-10-22 16:07:17,173 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 284 SyntacticMatches, 16 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1062 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=522, Invalid=2340, Unknown=0, NotChecked=0, Total=2862 [2018-10-22 16:07:17,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-10-22 16:07:17,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 90. [2018-10-22 16:07:17,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-10-22 16:07:17,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-10-22 16:07:17,181 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 79 [2018-10-22 16:07:17,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:17,181 INFO L481 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-10-22 16:07:17,181 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:07:17,182 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-10-22 16:07:17,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-22 16:07:17,183 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:17,183 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:17,183 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:17,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:17,183 INFO L82 PathProgramCache]: Analyzing trace with hash -2119833059, now seen corresponding path program 13 times [2018-10-22 16:07:17,183 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:17,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:17,184 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:17,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:17,184 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:17,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:17,902 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 97 proven. 112 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:07:17,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:17,902 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:17,902 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:17,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:17,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:17,902 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:17,910 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:17,910 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:07:17,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:17,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:18,568 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 13 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:07:18,569 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:19,622 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 13 proven. 196 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:07:19,644 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:19,644 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:07:19,659 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:19,659 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:07:19,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:19,720 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:19,903 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 14 proven. 177 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:07:19,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:20,326 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 14 proven. 177 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:07:20,328 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:20,328 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 23, 22] total 63 [2018-10-22 16:07:20,328 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:20,328 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-22 16:07:20,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-22 16:07:20,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=513, Invalid=3393, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:07:20,330 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 42 states. [2018-10-22 16:07:21,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:21,769 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2018-10-22 16:07:21,769 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:07:21,769 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 87 [2018-10-22 16:07:21,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:21,772 INFO L225 Difference]: With dead ends: 169 [2018-10-22 16:07:21,772 INFO L226 Difference]: Without dead ends: 102 [2018-10-22 16:07:21,775 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 300 SyntacticMatches, 11 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1844 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=733, Invalid=4817, Unknown=0, NotChecked=0, Total=5550 [2018-10-22 16:07:21,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-22 16:07:21,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 92. [2018-10-22 16:07:21,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-10-22 16:07:21,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2018-10-22 16:07:21,783 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 87 [2018-10-22 16:07:21,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:21,783 INFO L481 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2018-10-22 16:07:21,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-22 16:07:21,783 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2018-10-22 16:07:21,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-10-22 16:07:21,784 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:21,784 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:21,784 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:21,784 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:21,785 INFO L82 PathProgramCache]: Analyzing trace with hash -2025415145, now seen corresponding path program 14 times [2018-10-22 16:07:21,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:21,785 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:21,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:21,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:21,786 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:21,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:22,082 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 85 proven. 142 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-22 16:07:22,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:22,083 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:22,083 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:22,083 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:22,083 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:22,083 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:22,091 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:22,091 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:22,118 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:22,118 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:22,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:22,630 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 14 proven. 195 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:07:22,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:22,936 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 14 proven. 195 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:07:22,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:22,957 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:07:22,973 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:22,974 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:23,034 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:23,035 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:23,039 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:23,057 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 14 proven. 195 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:07:23,057 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:23,358 INFO L134 CoverageAnalysis]: Checked inductivity of 293 backedges. 14 proven. 195 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-22 16:07:23,360 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:23,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21, 21, 21] total 42 [2018-10-22 16:07:23,360 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:23,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:07:23,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:07:23,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=1440, Unknown=0, NotChecked=0, Total=1722 [2018-10-22 16:07:23,362 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand 33 states. [2018-10-22 16:07:24,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:24,095 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-10-22 16:07:24,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:07:24,096 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 89 [2018-10-22 16:07:24,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:24,097 INFO L225 Difference]: With dead ends: 107 [2018-10-22 16:07:24,098 INFO L226 Difference]: Without dead ends: 105 [2018-10-22 16:07:24,099 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 320 SyntacticMatches, 18 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1344 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=644, Invalid=2896, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:07:24,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-22 16:07:24,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2018-10-22 16:07:24,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-10-22 16:07:24,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-10-22 16:07:24,106 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 89 [2018-10-22 16:07:24,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:24,107 INFO L481 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-10-22 16:07:24,107 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:07:24,107 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-10-22 16:07:24,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-10-22 16:07:24,108 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:24,108 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:24,109 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:24,109 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:24,109 INFO L82 PathProgramCache]: Analyzing trace with hash 147075930, now seen corresponding path program 15 times [2018-10-22 16:07:24,109 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:24,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:24,110 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:24,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:24,110 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:24,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:25,163 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 127 proven. 136 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:07:25,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:25,163 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:25,163 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:25,163 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:25,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:25,163 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:25,170 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:25,170 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:25,214 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:07:25,214 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:25,217 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:26,075 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 36 proven. 227 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:07:26,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:27,085 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 36 proven. 227 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:07:27,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:27,105 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 35 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 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:27,120 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:27,121 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:27,291 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 16:07:27,291 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:27,297 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:28,155 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 16 proven. 226 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:07:28,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:28,772 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 16 proven. 226 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:07:28,773 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:28,773 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 26, 24, 24] total 93 [2018-10-22 16:07:28,773 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:28,774 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-22 16:07:28,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-22 16:07:28,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=998, Invalid=7558, Unknown=0, NotChecked=0, Total=8556 [2018-10-22 16:07:28,776 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 47 states. [2018-10-22 16:07:30,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:30,125 INFO L93 Difference]: Finished difference Result 149 states and 160 transitions. [2018-10-22 16:07:30,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:07:30,125 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 97 [2018-10-22 16:07:30,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:30,127 INFO L225 Difference]: With dead ends: 149 [2018-10-22 16:07:30,127 INFO L226 Difference]: Without dead ends: 102 [2018-10-22 16:07:30,130 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 314 SyntacticMatches, 9 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4863 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1255, Invalid=10087, Unknown=0, NotChecked=0, Total=11342 [2018-10-22 16:07:30,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-10-22 16:07:30,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2018-10-22 16:07:30,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-10-22 16:07:30,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2018-10-22 16:07:30,137 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 97 [2018-10-22 16:07:30,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:30,137 INFO L481 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2018-10-22 16:07:30,137 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-22 16:07:30,138 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2018-10-22 16:07:30,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-10-22 16:07:30,139 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:30,139 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:30,139 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:30,139 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:30,139 INFO L82 PathProgramCache]: Analyzing trace with hash -692603180, now seen corresponding path program 16 times [2018-10-22 16:07:30,139 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:30,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:30,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:30,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:30,140 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:30,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:30,454 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 105 proven. 178 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:07:30,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:30,455 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:30,455 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:30,455 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:30,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:30,455 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:30,462 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:30,462 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:30,495 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:30,495 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:30,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:31,078 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 15 proven. 268 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:07:31,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:31,480 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 15 proven. 268 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-22 16:07:31,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:31,500 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 37 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 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:31,516 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:07:31,517 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:07:31,605 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:07:31,606 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:31,611 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:31,639 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 16 proven. 246 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:07:31,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:31,859 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 16 proven. 246 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-22 16:07:31,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:31,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25, 23, 23] total 48 [2018-10-22 16:07:31,861 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:31,861 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-22 16:07:31,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-22 16:07:31,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=1911, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:07:31,862 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand 36 states. [2018-10-22 16:07:32,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:32,894 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2018-10-22 16:07:32,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:07:32,895 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 99 [2018-10-22 16:07:32,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:32,896 INFO L225 Difference]: With dead ends: 117 [2018-10-22 16:07:32,896 INFO L226 Difference]: Without dead ends: 115 [2018-10-22 16:07:32,897 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 352 SyntacticMatches, 22 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1803 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=790, Invalid=3766, Unknown=0, NotChecked=0, Total=4556 [2018-10-22 16:07:32,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-10-22 16:07:32,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 110. [2018-10-22 16:07:32,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-10-22 16:07:32,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2018-10-22 16:07:32,905 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 99 [2018-10-22 16:07:32,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:32,906 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2018-10-22 16:07:32,906 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-22 16:07:32,906 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2018-10-22 16:07:32,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-10-22 16:07:32,907 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:32,907 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:32,907 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:32,907 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:32,907 INFO L82 PathProgramCache]: Analyzing trace with hash 941834007, now seen corresponding path program 17 times [2018-10-22 16:07:32,907 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:32,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:32,908 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:32,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:32,909 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:32,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:33,993 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 161 proven. 162 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-22 16:07:33,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:33,994 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:33,994 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:33,994 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:33,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:33,995 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:34,003 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:07:34,004 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:34,047 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2018-10-22 16:07:34,048 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:34,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:34,890 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 41 proven. 282 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-22 16:07:34,890 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:36,528 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 41 proven. 282 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-22 16:07:36,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:36,550 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 39 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 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:36,566 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:07:36,566 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:36,746 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2018-10-22 16:07:36,747 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:36,753 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:37,008 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 18 proven. 281 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:07:37,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:37,272 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 18 proven. 281 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:07:37,274 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:37,274 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 27, 26] total 74 [2018-10-22 16:07:37,274 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:37,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-22 16:07:37,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-22 16:07:37,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=682, Invalid=4720, Unknown=0, NotChecked=0, Total=5402 [2018-10-22 16:07:37,276 INFO L87 Difference]: Start difference. First operand 110 states and 111 transitions. Second operand 50 states. [2018-10-22 16:07:39,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:39,127 INFO L93 Difference]: Finished difference Result 205 states and 210 transitions. [2018-10-22 16:07:39,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-22 16:07:39,127 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 107 [2018-10-22 16:07:39,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:39,128 INFO L225 Difference]: With dead ends: 205 [2018-10-22 16:07:39,128 INFO L226 Difference]: Without dead ends: 122 [2018-10-22 16:07:39,130 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 372 SyntacticMatches, 12 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2583 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=972, Invalid=6684, Unknown=0, NotChecked=0, Total=7656 [2018-10-22 16:07:39,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-10-22 16:07:39,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 112. [2018-10-22 16:07:39,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-22 16:07:39,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-10-22 16:07:39,138 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 107 [2018-10-22 16:07:39,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:39,139 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-10-22 16:07:39,139 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-22 16:07:39,139 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-10-22 16:07:39,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-10-22 16:07:39,140 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:39,140 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:39,140 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:39,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:39,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1858875921, now seen corresponding path program 18 times [2018-10-22 16:07:39,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:39,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:39,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:39,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:39,141 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:39,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:40,265 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 127 proven. 218 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-22 16:07:40,265 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:40,265 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:40,265 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:40,265 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:40,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:40,266 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:40,272 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:07:40,273 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:07:40,316 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2018-10-22 16:07:40,316 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:40,320 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:40,664 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 18 proven. 303 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:07:40,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:41,466 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 18 proven. 303 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:07:41,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:41,486 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 41 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 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:41,500 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:07:41,501 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:07:41,700 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2018-10-22 16:07:41,701 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:41,705 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:41,720 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 18 proven. 303 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:07:41,720 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:41,992 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 18 proven. 303 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-22 16:07:41,993 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:41,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25, 25, 25] total 50 [2018-10-22 16:07:41,994 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:41,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-22 16:07:41,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-22 16:07:41,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=2053, Unknown=0, NotChecked=0, Total=2450 [2018-10-22 16:07:41,995 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 39 states. [2018-10-22 16:07:42,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:42,864 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2018-10-22 16:07:42,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:07:42,867 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 109 [2018-10-22 16:07:42,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:42,869 INFO L225 Difference]: With dead ends: 127 [2018-10-22 16:07:42,870 INFO L226 Difference]: Without dead ends: 125 [2018-10-22 16:07:42,871 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 392 SyntacticMatches, 22 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2007 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=927, Invalid=4185, Unknown=0, NotChecked=0, Total=5112 [2018-10-22 16:07:42,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2018-10-22 16:07:42,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 120. [2018-10-22 16:07:42,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-10-22 16:07:42,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2018-10-22 16:07:42,878 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 109 [2018-10-22 16:07:42,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:42,879 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2018-10-22 16:07:42,879 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-22 16:07:42,879 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2018-10-22 16:07:42,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-22 16:07:42,879 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:42,880 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:42,880 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:42,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:42,880 INFO L82 PathProgramCache]: Analyzing trace with hash -1311036076, now seen corresponding path program 19 times [2018-10-22 16:07:42,880 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:42,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:42,881 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:42,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:42,881 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:42,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:43,740 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 199 proven. 190 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:07:43,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:43,740 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:43,740 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:43,740 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:43,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:43,741 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:43,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:43,750 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:07:43,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:43,789 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:44,720 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 19 proven. 370 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:07:44,720 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:46,566 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 19 proven. 370 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:07:46,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:46,587 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 43 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 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:46,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:46,603 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:07:46,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:46,688 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:47,653 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 20 proven. 342 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:07:47,654 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:47,922 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 20 proven. 342 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:07:47,924 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:47,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 29, 28] total 81 [2018-10-22 16:07:47,924 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:47,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-22 16:07:47,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-22 16:07:47,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=834, Invalid=5646, Unknown=0, NotChecked=0, Total=6480 [2018-10-22 16:07:47,926 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand 54 states. [2018-10-22 16:07:50,775 WARN L179 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-10-22 16:07:50,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:50,995 INFO L93 Difference]: Finished difference Result 223 states and 228 transitions. [2018-10-22 16:07:50,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:07:50,996 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 117 [2018-10-22 16:07:50,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:50,997 INFO L225 Difference]: With dead ends: 223 [2018-10-22 16:07:50,998 INFO L226 Difference]: Without dead ends: 132 [2018-10-22 16:07:50,999 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 408 SyntacticMatches, 11 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3005 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1177, Invalid=7943, Unknown=0, NotChecked=0, Total=9120 [2018-10-22 16:07:50,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-22 16:07:51,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 122. [2018-10-22 16:07:51,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-10-22 16:07:51,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2018-10-22 16:07:51,007 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 117 [2018-10-22 16:07:51,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:51,007 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2018-10-22 16:07:51,007 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-22 16:07:51,007 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2018-10-22 16:07:51,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-10-22 16:07:51,008 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:51,008 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:51,008 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:51,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:51,009 INFO L82 PathProgramCache]: Analyzing trace with hash 1322528718, now seen corresponding path program 20 times [2018-10-22 16:07:51,009 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:51,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:51,010 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:07:51,010 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:51,010 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:51,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:51,658 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 151 proven. 262 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-22 16:07:51,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:51,658 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:51,658 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:51,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:51,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:51,659 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:51,667 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:51,667 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:51,724 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:51,724 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:51,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:52,432 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 20 proven. 366 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:07:52,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:52,880 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 20 proven. 366 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:07:52,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:52,901 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 45 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 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:52,915 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:07:52,916 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:07:53,000 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:07:53,000 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:53,006 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:53,026 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 20 proven. 366 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:07:53,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:53,281 INFO L134 CoverageAnalysis]: Checked inductivity of 566 backedges. 20 proven. 366 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-22 16:07:53,283 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:07:53,283 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27, 27, 27] total 54 [2018-10-22 16:07:53,284 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:07:53,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-22 16:07:53,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-22 16:07:53,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=2400, Unknown=0, NotChecked=0, Total=2862 [2018-10-22 16:07:53,285 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand 42 states. [2018-10-22 16:07:54,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:07:54,466 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-10-22 16:07:54,467 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:07:54,467 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 119 [2018-10-22 16:07:54,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:07:54,469 INFO L225 Difference]: With dead ends: 137 [2018-10-22 16:07:54,469 INFO L226 Difference]: Without dead ends: 135 [2018-10-22 16:07:54,470 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 428 SyntacticMatches, 24 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2388 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1088, Invalid=4918, Unknown=0, NotChecked=0, Total=6006 [2018-10-22 16:07:54,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-10-22 16:07:54,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 130. [2018-10-22 16:07:54,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-22 16:07:54,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-22 16:07:54,479 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 119 [2018-10-22 16:07:54,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:07:54,480 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-22 16:07:54,480 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-22 16:07:54,480 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-22 16:07:54,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-10-22 16:07:54,481 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:07:54,481 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:07:54,481 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:07:54,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:07:54,481 INFO L82 PathProgramCache]: Analyzing trace with hash -1290002927, now seen corresponding path program 21 times [2018-10-22 16:07:54,482 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:07:54,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:54,482 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:07:54,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:07:54,483 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:07:54,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:07:55,542 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 241 proven. 220 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-22 16:07:55,543 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:55,543 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:07:55,543 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:07:55,543 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:07:55,543 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:55,543 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:07:55,550 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:55,550 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:55,600 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-22 16:07:55,600 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:55,603 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:07:56,789 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 51 proven. 410 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-22 16:07:56,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:07:58,635 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 51 proven. 410 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-22 16:07:58,655 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:07:58,655 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 47 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 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:07:58,670 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:07:58,670 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:07:58,917 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-22 16:07:58,917 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:07:58,924 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:00,148 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 22 proven. 409 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:00,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:01,117 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 22 proven. 409 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:01,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:01,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33, 32, 30, 30] total 120 [2018-10-22 16:08:01,118 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:01,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-22 16:08:01,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-22 16:08:01,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1652, Invalid=12628, Unknown=0, NotChecked=0, Total=14280 [2018-10-22 16:08:01,122 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 59 states. [2018-10-22 16:08:03,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:03,417 INFO L93 Difference]: Finished difference Result 191 states and 205 transitions. [2018-10-22 16:08:03,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-22 16:08:03,417 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 127 [2018-10-22 16:08:03,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:03,419 INFO L225 Difference]: With dead ends: 191 [2018-10-22 16:08:03,419 INFO L226 Difference]: Without dead ends: 132 [2018-10-22 16:08:03,421 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 413 SyntacticMatches, 9 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8370 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=2020, Invalid=16612, Unknown=0, NotChecked=0, Total=18632 [2018-10-22 16:08:03,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-10-22 16:08:03,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2018-10-22 16:08:03,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-10-22 16:08:03,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2018-10-22 16:08:03,432 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 127 [2018-10-22 16:08:03,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:03,432 INFO L481 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2018-10-22 16:08:03,433 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-22 16:08:03,433 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2018-10-22 16:08:03,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-22 16:08:03,433 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:03,434 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:03,434 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:03,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:03,434 INFO L82 PathProgramCache]: Analyzing trace with hash -348663797, now seen corresponding path program 22 times [2018-10-22 16:08:03,434 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:03,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:03,435 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:03,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:03,435 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:03,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:03,885 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 177 proven. 310 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-22 16:08:03,885 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:03,885 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:03,885 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:03,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:03,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:03,886 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:03,892 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:03,893 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:03,932 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:03,932 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:03,935 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:04,364 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 21 proven. 466 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-22 16:08:04,364 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:04,963 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 21 proven. 466 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-22 16:08:04,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:04,985 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 49 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 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:05,000 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:05,001 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:05,113 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:05,113 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:05,119 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:05,139 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 22 proven. 435 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:05,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:05,340 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 22 proven. 435 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-22 16:08:05,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:05,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31, 31, 29, 29] total 60 [2018-10-22 16:08:05,341 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:05,342 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-22 16:08:05,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-22 16:08:05,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=3000, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:08:05,343 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand 45 states. [2018-10-22 16:08:07,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:07,636 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-10-22 16:08:07,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-22 16:08:07,636 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 129 [2018-10-22 16:08:07,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:07,638 INFO L225 Difference]: With dead ends: 147 [2018-10-22 16:08:07,638 INFO L226 Difference]: Without dead ends: 145 [2018-10-22 16:08:07,640 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 460 SyntacticMatches, 28 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2991 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1273, Invalid=6037, Unknown=0, NotChecked=0, Total=7310 [2018-10-22 16:08:07,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-10-22 16:08:07,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2018-10-22 16:08:07,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-10-22 16:08:07,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 141 transitions. [2018-10-22 16:08:07,650 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 141 transitions. Word has length 129 [2018-10-22 16:08:07,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:07,651 INFO L481 AbstractCegarLoop]: Abstraction has 140 states and 141 transitions. [2018-10-22 16:08:07,651 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-22 16:08:07,651 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 141 transitions. [2018-10-22 16:08:07,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-10-22 16:08:07,652 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:07,652 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:07,652 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:07,652 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:07,652 INFO L82 PathProgramCache]: Analyzing trace with hash 1445867854, now seen corresponding path program 23 times [2018-10-22 16:08:07,652 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:07,653 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:07,654 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:07,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:07,654 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:07,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:08,794 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 287 proven. 252 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-22 16:08:08,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:08,795 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:08,795 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:08,795 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:08,795 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:08,795 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:08,808 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:08,809 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:08,861 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2018-10-22 16:08:08,861 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:08,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:10,239 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 56 proven. 483 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-22 16:08:10,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:12,642 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 56 proven. 483 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-22 16:08:12,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:12,664 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 51 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 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:12,679 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:12,679 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:12,968 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2018-10-22 16:08:12,968 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:12,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:13,339 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 24 proven. 482 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:13,339 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:13,647 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 24 proven. 482 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:13,648 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:13,648 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 33, 32] total 92 [2018-10-22 16:08:13,648 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:13,649 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-10-22 16:08:13,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-10-22 16:08:13,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1049, Invalid=7323, Unknown=0, NotChecked=0, Total=8372 [2018-10-22 16:08:13,650 INFO L87 Difference]: Start difference. First operand 140 states and 141 transitions. Second operand 62 states. [2018-10-22 16:08:15,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:15,949 INFO L93 Difference]: Finished difference Result 259 states and 264 transitions. [2018-10-22 16:08:15,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-22 16:08:15,949 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 137 [2018-10-22 16:08:15,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:15,951 INFO L225 Difference]: With dead ends: 259 [2018-10-22 16:08:15,951 INFO L226 Difference]: Without dead ends: 152 [2018-10-22 16:08:15,953 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 599 GetRequests, 480 SyntacticMatches, 12 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3916 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1477, Invalid=10295, Unknown=0, NotChecked=0, Total=11772 [2018-10-22 16:08:15,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-10-22 16:08:15,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 142. [2018-10-22 16:08:15,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-10-22 16:08:15,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2018-10-22 16:08:15,963 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 137 [2018-10-22 16:08:15,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:15,964 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2018-10-22 16:08:15,964 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-10-22 16:08:15,964 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2018-10-22 16:08:15,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-10-22 16:08:15,965 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:15,965 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:15,965 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:15,965 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:15,965 INFO L82 PathProgramCache]: Analyzing trace with hash -277400888, now seen corresponding path program 24 times [2018-10-22 16:08:15,965 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:15,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:15,966 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:15,966 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:15,966 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:15,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:16,539 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 205 proven. 362 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-22 16:08:16,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:16,540 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:16,540 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:16,540 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:16,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:16,540 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:16,552 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:16,552 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:16,616 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2018-10-22 16:08:16,616 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:16,620 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:17,356 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 24 proven. 510 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:17,356 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:17,991 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 24 proven. 510 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:18,011 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:18,012 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 53 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 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:18,027 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:08:18,027 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:08:18,298 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2018-10-22 16:08:18,299 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:18,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:18,334 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 24 proven. 510 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:18,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:18,566 INFO L134 CoverageAnalysis]: Checked inductivity of 798 backedges. 24 proven. 510 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-22 16:08:18,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:18,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31, 31, 31] total 62 [2018-10-22 16:08:18,568 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:18,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-22 16:08:18,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-22 16:08:18,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=3175, Unknown=0, NotChecked=0, Total=3782 [2018-10-22 16:08:18,569 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand 48 states. [2018-10-22 16:08:20,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:20,530 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2018-10-22 16:08:20,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-22 16:08:20,531 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 139 [2018-10-22 16:08:20,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:20,533 INFO L225 Difference]: With dead ends: 157 [2018-10-22 16:08:20,533 INFO L226 Difference]: Without dead ends: 155 [2018-10-22 16:08:20,535 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 616 GetRequests, 500 SyntacticMatches, 28 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3249 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1449, Invalid=6561, Unknown=0, NotChecked=0, Total=8010 [2018-10-22 16:08:20,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2018-10-22 16:08:20,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 150. [2018-10-22 16:08:20,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-22 16:08:20,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2018-10-22 16:08:20,545 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 139 [2018-10-22 16:08:20,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:20,546 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2018-10-22 16:08:20,546 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-22 16:08:20,546 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2018-10-22 16:08:20,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-10-22 16:08:20,547 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:20,547 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:20,547 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:20,548 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:20,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1416726283, now seen corresponding path program 25 times [2018-10-22 16:08:20,548 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:20,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:20,549 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:20,549 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:20,549 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:20,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:21,736 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 337 proven. 286 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-22 16:08:21,736 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:21,736 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:21,736 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:21,736 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:21,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:21,737 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:21,745 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:21,745 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:21,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:21,789 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:23,428 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 25 proven. 598 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-22 16:08:23,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:25,700 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 25 proven. 598 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-22 16:08:25,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:25,720 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 55 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 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:25,735 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:25,735 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:08:25,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:25,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:26,523 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 26 proven. 561 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:26,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:26,828 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 26 proven. 561 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:26,830 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:26,830 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 35, 34] total 99 [2018-10-22 16:08:26,830 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:26,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-22 16:08:26,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-22 16:08:26,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1236, Invalid=8466, Unknown=0, NotChecked=0, Total=9702 [2018-10-22 16:08:26,832 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand 66 states. [2018-10-22 16:08:29,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:29,728 INFO L93 Difference]: Finished difference Result 277 states and 282 transitions. [2018-10-22 16:08:29,728 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-22 16:08:29,728 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 147 [2018-10-22 16:08:29,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:29,730 INFO L225 Difference]: With dead ends: 277 [2018-10-22 16:08:29,731 INFO L226 Difference]: Without dead ends: 162 [2018-10-22 16:08:29,732 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 642 GetRequests, 516 SyntacticMatches, 11 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4436 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=1729, Invalid=11843, Unknown=0, NotChecked=0, Total=13572 [2018-10-22 16:08:29,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-22 16:08:29,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 152. [2018-10-22 16:08:29,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-10-22 16:08:29,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 153 transitions. [2018-10-22 16:08:29,742 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 153 transitions. Word has length 147 [2018-10-22 16:08:29,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:29,742 INFO L481 AbstractCegarLoop]: Abstraction has 152 states and 153 transitions. [2018-10-22 16:08:29,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-22 16:08:29,742 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 153 transitions. [2018-10-22 16:08:29,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-10-22 16:08:29,743 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:29,743 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:29,743 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:29,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:29,744 INFO L82 PathProgramCache]: Analyzing trace with hash -2144700411, now seen corresponding path program 26 times [2018-10-22 16:08:29,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:29,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:29,744 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:08:29,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:29,744 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:29,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:31,288 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 235 proven. 418 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-22 16:08:31,288 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:31,288 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:31,288 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:31,289 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:31,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:31,289 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:31,297 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:31,297 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:31,344 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:31,344 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:31,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:31,866 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 26 proven. 591 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:31,867 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:32,787 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 26 proven. 591 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:32,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:32,808 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 57 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 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:32,823 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:08:32,823 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:32,924 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:08:32,925 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:32,931 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:32,964 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 26 proven. 591 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:32,964 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:33,433 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 26 proven. 591 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-22 16:08:33,435 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:33,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33, 33, 33] total 66 [2018-10-22 16:08:33,435 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:33,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-22 16:08:33,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-22 16:08:33,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=687, Invalid=3603, Unknown=0, NotChecked=0, Total=4290 [2018-10-22 16:08:33,436 INFO L87 Difference]: Start difference. First operand 152 states and 153 transitions. Second operand 51 states. [2018-10-22 16:08:35,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:35,074 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2018-10-22 16:08:35,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-22 16:08:35,075 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 149 [2018-10-22 16:08:35,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:35,077 INFO L225 Difference]: With dead ends: 167 [2018-10-22 16:08:35,077 INFO L226 Difference]: Without dead ends: 165 [2018-10-22 16:08:35,078 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 536 SyntacticMatches, 30 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3729 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1649, Invalid=7471, Unknown=0, NotChecked=0, Total=9120 [2018-10-22 16:08:35,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2018-10-22 16:08:35,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 160. [2018-10-22 16:08:35,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-10-22 16:08:35,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-10-22 16:08:35,090 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 149 [2018-10-22 16:08:35,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:35,090 INFO L481 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-10-22 16:08:35,090 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-22 16:08:35,090 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-10-22 16:08:35,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-10-22 16:08:35,091 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:35,092 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:35,092 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:35,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:35,092 INFO L82 PathProgramCache]: Analyzing trace with hash 1214136136, now seen corresponding path program 27 times [2018-10-22 16:08:35,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:35,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:35,093 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:35,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:35,093 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:35,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:36,371 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 391 proven. 322 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-22 16:08:36,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:36,372 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:36,372 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:36,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:36,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:36,372 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:36,392 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:36,392 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:36,538 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:08:36,538 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:36,541 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:38,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 66 proven. 647 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-22 16:08:38,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:40,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 66 proven. 647 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-22 16:08:40,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:40,203 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 59 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 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:40,218 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:08:40,218 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:08:40,565 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-22 16:08:40,566 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:40,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:42,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 28 proven. 646 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:42,451 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:43,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 28 proven. 646 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:43,952 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:43,953 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 39, 38, 36, 36] total 147 [2018-10-22 16:08:43,953 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:43,953 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-22 16:08:43,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-22 16:08:43,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2477, Invalid=18985, Unknown=0, NotChecked=0, Total=21462 [2018-10-22 16:08:43,955 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 71 states. [2018-10-22 16:08:46,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:46,740 INFO L93 Difference]: Finished difference Result 233 states and 250 transitions. [2018-10-22 16:08:46,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-22 16:08:46,740 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 157 [2018-10-22 16:08:46,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:46,742 INFO L225 Difference]: With dead ends: 233 [2018-10-22 16:08:46,742 INFO L226 Difference]: Without dead ends: 162 [2018-10-22 16:08:46,745 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 512 SyntacticMatches, 9 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12822 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=2974, Invalid=24748, Unknown=0, NotChecked=0, Total=27722 [2018-10-22 16:08:46,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-10-22 16:08:46,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2018-10-22 16:08:46,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-10-22 16:08:46,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2018-10-22 16:08:46,757 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 157 [2018-10-22 16:08:46,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:46,758 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2018-10-22 16:08:46,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-22 16:08:46,758 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2018-10-22 16:08:46,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-22 16:08:46,759 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:46,759 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:46,759 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:46,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:46,759 INFO L82 PathProgramCache]: Analyzing trace with hash -50217022, now seen corresponding path program 28 times [2018-10-22 16:08:46,760 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:46,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:46,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:46,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:46,761 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:46,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:47,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 267 proven. 478 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-22 16:08:47,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:47,750 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:47,750 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:47,750 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:47,750 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:47,750 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:47,758 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:47,758 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:47,805 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:47,805 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:47,808 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:48,441 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 27 proven. 718 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-22 16:08:48,442 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:49,385 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 27 proven. 718 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-22 16:08:49,405 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:49,406 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 61 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 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:49,420 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:08:49,420 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:08:49,544 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:08:49,544 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:49,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:49,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 28 proven. 678 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:49,578 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:49,869 INFO L134 CoverageAnalysis]: Checked inductivity of 1070 backedges. 28 proven. 678 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-22 16:08:49,870 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:08:49,871 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 37, 37, 35, 35] total 72 [2018-10-22 16:08:49,871 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:08:49,871 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-10-22 16:08:49,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-10-22 16:08:49,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=780, Invalid=4332, Unknown=0, NotChecked=0, Total=5112 [2018-10-22 16:08:49,872 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand 54 states. [2018-10-22 16:08:51,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:08:51,510 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2018-10-22 16:08:51,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-22 16:08:51,510 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 159 [2018-10-22 16:08:51,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:08:51,512 INFO L225 Difference]: With dead ends: 177 [2018-10-22 16:08:51,512 INFO L226 Difference]: Without dead ends: 175 [2018-10-22 16:08:51,514 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 704 GetRequests, 568 SyntacticMatches, 34 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4476 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1873, Invalid=8839, Unknown=0, NotChecked=0, Total=10712 [2018-10-22 16:08:51,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-10-22 16:08:51,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 170. [2018-10-22 16:08:51,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-10-22 16:08:51,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 171 transitions. [2018-10-22 16:08:51,526 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 171 transitions. Word has length 159 [2018-10-22 16:08:51,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:08:51,526 INFO L481 AbstractCegarLoop]: Abstraction has 170 states and 171 transitions. [2018-10-22 16:08:51,526 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-10-22 16:08:51,527 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 171 transitions. [2018-10-22 16:08:51,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-10-22 16:08:51,528 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:08:51,528 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:08:51,528 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:08:51,528 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:08:51,528 INFO L82 PathProgramCache]: Analyzing trace with hash 1870952965, now seen corresponding path program 29 times [2018-10-22 16:08:51,529 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:08:51,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:51,529 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:08:51,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:08:51,530 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:08:51,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:08:53,278 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 449 proven. 360 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-22 16:08:53,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:53,279 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:08:53,279 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:08:53,279 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:08:53,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:53,279 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:08:53,287 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:53,288 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:53,359 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2018-10-22 16:08:53,359 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:53,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:55,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 71 proven. 738 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-22 16:08:55,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:08:58,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 71 proven. 738 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-22 16:08:58,262 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:08:58,262 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 63 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 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:08:58,277 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:08:58,277 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:08:58,688 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2018-10-22 16:08:58,688 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:08:58,695 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:08:59,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 30 proven. 737 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:08:59,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:00,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 30 proven. 737 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:09:00,245 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:00,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40, 39, 38] total 110 [2018-10-22 16:09:00,246 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:00,246 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-10-22 16:09:00,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-10-22 16:09:00,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1496, Invalid=10494, Unknown=0, NotChecked=0, Total=11990 [2018-10-22 16:09:00,248 INFO L87 Difference]: Start difference. First operand 170 states and 171 transitions. Second operand 74 states. [2018-10-22 16:09:03,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:03,130 INFO L93 Difference]: Finished difference Result 313 states and 318 transitions. [2018-10-22 16:09:03,130 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-22 16:09:03,130 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 167 [2018-10-22 16:09:03,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:03,133 INFO L225 Difference]: With dead ends: 313 [2018-10-22 16:09:03,133 INFO L226 Difference]: Without dead ends: 182 [2018-10-22 16:09:03,135 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 728 GetRequests, 588 SyntacticMatches, 12 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5524 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=2089, Invalid=14681, Unknown=0, NotChecked=0, Total=16770 [2018-10-22 16:09:03,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-10-22 16:09:03,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 172. [2018-10-22 16:09:03,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-10-22 16:09:03,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-10-22 16:09:03,148 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 167 [2018-10-22 16:09:03,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:03,148 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-10-22 16:09:03,148 INFO L482 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-10-22 16:09:03,148 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-10-22 16:09:03,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-10-22 16:09:03,150 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:03,150 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:03,150 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:03,150 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:03,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1120217599, now seen corresponding path program 30 times [2018-10-22 16:09:03,151 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:03,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:03,151 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:03,151 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:03,151 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:03,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:03,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 301 proven. 542 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-22 16:09:03,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:03,854 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:03,854 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:03,854 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:03,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:03,854 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:03,861 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:03,862 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:03,950 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2018-10-22 16:09:03,950 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:03,955 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:05,333 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 30 proven. 771 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:09:05,333 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:06,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 30 proven. 771 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:09:06,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:06,198 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 65 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 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:06,213 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:09:06,213 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:09:06,585 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2018-10-22 16:09:06,585 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:06,593 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:06,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 30 proven. 771 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:09:06,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:06,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1221 backedges. 30 proven. 771 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-22 16:09:06,954 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:06,954 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37, 37, 37] total 74 [2018-10-22 16:09:06,954 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:06,955 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-22 16:09:06,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-22 16:09:06,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=862, Invalid=4540, Unknown=0, NotChecked=0, Total=5402 [2018-10-22 16:09:06,956 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 57 states. [2018-10-22 16:09:09,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:09,929 INFO L93 Difference]: Finished difference Result 187 states and 189 transitions. [2018-10-22 16:09:09,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-22 16:09:09,930 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 169 [2018-10-22 16:09:09,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:09,932 INFO L225 Difference]: With dead ends: 187 [2018-10-22 16:09:09,932 INFO L226 Difference]: Without dead ends: 185 [2018-10-22 16:09:09,933 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 748 GetRequests, 608 SyntacticMatches, 34 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4788 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=2088, Invalid=9468, Unknown=0, NotChecked=0, Total=11556 [2018-10-22 16:09:09,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2018-10-22 16:09:09,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 180. [2018-10-22 16:09:09,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-10-22 16:09:09,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 181 transitions. [2018-10-22 16:09:09,946 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 181 transitions. Word has length 169 [2018-10-22 16:09:09,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:09,947 INFO L481 AbstractCegarLoop]: Abstraction has 180 states and 181 transitions. [2018-10-22 16:09:09,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-22 16:09:09,947 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 181 transitions. [2018-10-22 16:09:09,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-10-22 16:09:09,948 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:09,948 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:09,948 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:09,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:09,949 INFO L82 PathProgramCache]: Analyzing trace with hash -326346942, now seen corresponding path program 31 times [2018-10-22 16:09:09,949 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:09,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:09,950 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:09,950 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:09,950 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:09,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:11,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 511 proven. 400 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-22 16:09:11,455 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:11,456 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:11,456 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:11,456 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:11,456 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:11,456 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:11,463 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:11,463 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:11,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:11,515 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:13,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 31 proven. 880 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-22 16:09:13,706 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:17,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 31 proven. 880 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-22 16:09:17,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:17,376 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 67 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 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:17,390 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:17,390 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:09:17,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:17,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:17,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 32 proven. 834 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:09:17,793 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:18,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 32 proven. 834 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:09:18,160 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:18,160 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42, 41, 40] total 117 [2018-10-22 16:09:18,160 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:18,161 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-10-22 16:09:18,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-10-22 16:09:18,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1719, Invalid=11853, Unknown=0, NotChecked=0, Total=13572 [2018-10-22 16:09:18,163 INFO L87 Difference]: Start difference. First operand 180 states and 181 transitions. Second operand 78 states. [2018-10-22 16:09:20,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:20,956 INFO L93 Difference]: Finished difference Result 331 states and 336 transitions. [2018-10-22 16:09:20,956 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-22 16:09:20,956 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 177 [2018-10-22 16:09:20,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:20,958 INFO L225 Difference]: With dead ends: 331 [2018-10-22 16:09:20,958 INFO L226 Difference]: Without dead ends: 192 [2018-10-22 16:09:20,960 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 771 GetRequests, 624 SyntacticMatches, 11 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6137 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=2389, Invalid=16517, Unknown=0, NotChecked=0, Total=18906 [2018-10-22 16:09:20,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-10-22 16:09:20,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 182. [2018-10-22 16:09:20,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-10-22 16:09:20,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2018-10-22 16:09:20,974 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 177 [2018-10-22 16:09:20,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:20,974 INFO L481 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2018-10-22 16:09:20,974 INFO L482 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-10-22 16:09:20,975 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2018-10-22 16:09:20,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-10-22 16:09:20,976 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:20,976 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:20,976 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:20,976 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:20,977 INFO L82 PathProgramCache]: Analyzing trace with hash 1834276540, now seen corresponding path program 32 times [2018-10-22 16:09:20,977 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:20,977 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:20,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:09:20,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:20,978 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:20,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:21,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 337 proven. 610 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-22 16:09:21,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:21,642 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:21,642 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:21,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:21,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:21,642 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:21,649 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:21,649 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:21,703 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:21,704 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:21,707 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:22,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 32 proven. 870 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:09:22,466 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:23,620 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 32 proven. 870 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:09:23,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:23,640 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 69 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 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:23,656 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:09:23,656 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:23,780 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:09:23,781 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:23,789 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:23,834 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 32 proven. 870 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:09:23,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:24,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1382 backedges. 32 proven. 870 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-22 16:09:24,206 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:24,206 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39, 39, 39] total 78 [2018-10-22 16:09:24,206 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:24,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-10-22 16:09:24,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-10-22 16:09:24,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=957, Invalid=5049, Unknown=0, NotChecked=0, Total=6006 [2018-10-22 16:09:24,207 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand 60 states. [2018-10-22 16:09:26,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:26,100 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2018-10-22 16:09:26,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-22 16:09:26,101 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 179 [2018-10-22 16:09:26,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:26,103 INFO L225 Difference]: With dead ends: 197 [2018-10-22 16:09:26,103 INFO L226 Difference]: Without dead ends: 195 [2018-10-22 16:09:26,104 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 792 GetRequests, 644 SyntacticMatches, 36 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5367 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2327, Invalid=10555, Unknown=0, NotChecked=0, Total=12882 [2018-10-22 16:09:26,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-10-22 16:09:26,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 190. [2018-10-22 16:09:26,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-22 16:09:26,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-22 16:09:26,119 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 179 [2018-10-22 16:09:26,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:26,119 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-22 16:09:26,119 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-10-22 16:09:26,119 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-22 16:09:26,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-10-22 16:09:26,120 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:26,120 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:26,121 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:26,121 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:26,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1992952065, now seen corresponding path program 33 times [2018-10-22 16:09:26,121 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:26,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,122 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:26,122 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:26,122 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:26,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:27,969 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 577 proven. 442 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-22 16:09:27,970 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:27,970 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:27,970 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:27,970 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:27,970 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:27,970 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:27,977 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:27,977 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:28,083 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-22 16:09:28,083 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:28,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:29,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 81 proven. 938 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-22 16:09:29,974 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:32,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 81 proven. 938 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-22 16:09:32,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:32,847 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 71 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 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:32,862 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:09:32,862 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:09:33,313 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-22 16:09:33,313 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:33,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:35,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 34 proven. 937 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:09:35,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:38,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 34 proven. 937 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:09:38,055 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:38,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45, 44, 42, 42] total 174 [2018-10-22 16:09:38,055 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:38,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-10-22 16:09:38,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-10-22 16:09:38,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3473, Invalid=26629, Unknown=0, NotChecked=0, Total=30102 [2018-10-22 16:09:38,058 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 83 states. [2018-10-22 16:09:41,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:41,743 INFO L93 Difference]: Finished difference Result 275 states and 295 transitions. [2018-10-22 16:09:41,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-10-22 16:09:41,744 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 187 [2018-10-22 16:09:41,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:41,746 INFO L225 Difference]: With dead ends: 275 [2018-10-22 16:09:41,746 INFO L226 Difference]: Without dead ends: 192 [2018-10-22 16:09:41,749 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 815 GetRequests, 611 SyntacticMatches, 9 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18219 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=4117, Invalid=34495, Unknown=0, NotChecked=0, Total=38612 [2018-10-22 16:09:41,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-10-22 16:09:41,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2018-10-22 16:09:41,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-10-22 16:09:41,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 193 transitions. [2018-10-22 16:09:41,762 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 193 transitions. Word has length 187 [2018-10-22 16:09:41,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:41,763 INFO L481 AbstractCegarLoop]: Abstraction has 192 states and 193 transitions. [2018-10-22 16:09:41,763 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-10-22 16:09:41,763 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 193 transitions. [2018-10-22 16:09:41,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-22 16:09:41,764 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:41,764 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:41,765 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:41,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:41,765 INFO L82 PathProgramCache]: Analyzing trace with hash 430499321, now seen corresponding path program 34 times [2018-10-22 16:09:41,765 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:41,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:41,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:41,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:41,766 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:41,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:44,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 375 proven. 682 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-22 16:09:44,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,488 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:44,488 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:44,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:44,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:44,488 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:44,495 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:44,495 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:44,551 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:44,551 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:44,555 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:45,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 33 proven. 1024 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-22 16:09:45,503 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:46,604 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 33 proven. 1024 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-22 16:09:46,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:46,625 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 73 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 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:46,640 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:09:46,640 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:09:46,795 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:09:46,796 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:46,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:46,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 34 proven. 975 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:09:46,860 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:47,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1553 backedges. 34 proven. 975 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-22 16:09:47,305 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:47,305 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 43, 43, 41, 41] total 84 [2018-10-22 16:09:47,305 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:47,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-22 16:09:47,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-22 16:09:47,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1065, Invalid=5907, Unknown=0, NotChecked=0, Total=6972 [2018-10-22 16:09:47,307 INFO L87 Difference]: Start difference. First operand 192 states and 193 transitions. Second operand 63 states. [2018-10-22 16:09:49,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:09:49,763 INFO L93 Difference]: Finished difference Result 207 states and 209 transitions. [2018-10-22 16:09:49,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-22 16:09:49,763 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 189 [2018-10-22 16:09:49,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:09:49,765 INFO L225 Difference]: With dead ends: 207 [2018-10-22 16:09:49,765 INFO L226 Difference]: Without dead ends: 205 [2018-10-22 16:09:49,766 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 836 GetRequests, 676 SyntacticMatches, 40 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6258 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=2590, Invalid=12172, Unknown=0, NotChecked=0, Total=14762 [2018-10-22 16:09:49,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-10-22 16:09:49,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 200. [2018-10-22 16:09:49,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-10-22 16:09:49,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 201 transitions. [2018-10-22 16:09:49,780 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 201 transitions. Word has length 189 [2018-10-22 16:09:49,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:09:49,780 INFO L481 AbstractCegarLoop]: Abstraction has 200 states and 201 transitions. [2018-10-22 16:09:49,780 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-22 16:09:49,780 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 201 transitions. [2018-10-22 16:09:49,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-10-22 16:09:49,781 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:09:49,782 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:09:49,782 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:09:49,782 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:09:49,782 INFO L82 PathProgramCache]: Analyzing trace with hash -128353988, now seen corresponding path program 35 times [2018-10-22 16:09:49,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:09:49,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:49,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:09:49,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:09:49,783 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:09:49,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:09:51,818 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 647 proven. 486 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-22 16:09:51,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,818 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:09:51,818 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:09:51,818 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:09:51,818 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:51,818 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:09:51,827 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:51,827 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:51,902 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 20 check-sat command(s) [2018-10-22 16:09:51,903 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:51,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:54,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 86 proven. 1047 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-22 16:09:54,493 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:58,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 86 proven. 1047 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-22 16:09:58,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:09:58,334 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 75 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 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:09:58,350 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:09:58,350 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:09:58,927 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 20 check-sat command(s) [2018-10-22 16:09:58,927 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:09:58,935 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:09:59,445 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 36 proven. 1046 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:09:59,445 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:09:59,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 36 proven. 1046 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:09:59,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:09:59,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46, 45, 44] total 128 [2018-10-22 16:09:59,850 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:09:59,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-10-22 16:09:59,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-10-22 16:09:59,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2024, Invalid=14232, Unknown=0, NotChecked=0, Total=16256 [2018-10-22 16:09:59,852 INFO L87 Difference]: Start difference. First operand 200 states and 201 transitions. Second operand 86 states. [2018-10-22 16:10:04,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:04,063 INFO L93 Difference]: Finished difference Result 367 states and 372 transitions. [2018-10-22 16:10:04,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-22 16:10:04,067 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 197 [2018-10-22 16:10:04,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:04,068 INFO L225 Difference]: With dead ends: 367 [2018-10-22 16:10:04,068 INFO L226 Difference]: Without dead ends: 212 [2018-10-22 16:10:04,070 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 857 GetRequests, 696 SyntacticMatches, 12 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7402 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=2809, Invalid=19841, Unknown=0, NotChecked=0, Total=22650 [2018-10-22 16:10:04,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2018-10-22 16:10:04,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 202. [2018-10-22 16:10:04,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-22 16:10:04,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 203 transitions. [2018-10-22 16:10:04,084 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 203 transitions. Word has length 197 [2018-10-22 16:10:04,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:04,084 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 203 transitions. [2018-10-22 16:10:04,084 INFO L482 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-10-22 16:10:04,085 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 203 transitions. [2018-10-22 16:10:04,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2018-10-22 16:10:04,086 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:04,086 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:04,086 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:04,086 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:04,087 INFO L82 PathProgramCache]: Analyzing trace with hash 668039094, now seen corresponding path program 36 times [2018-10-22 16:10:04,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:04,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:04,087 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:04,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:04,088 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:04,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:05,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 415 proven. 758 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-22 16:10:05,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:05,699 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:05,699 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:05,699 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:05,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:05,699 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:05,706 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:05,707 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:05,787 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2018-10-22 16:10:05,787 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:05,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:06,666 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 36 proven. 1086 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:10:06,666 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:07,744 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 36 proven. 1086 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:10:07,764 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:07,765 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 77 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 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:07,779 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:10:07,779 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:10:08,327 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2018-10-22 16:10:08,327 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:08,342 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:08,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 36 proven. 1086 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:10:08,382 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:08,836 INFO L134 CoverageAnalysis]: Checked inductivity of 1734 backedges. 36 proven. 1086 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-22 16:10:08,838 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:08,838 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43, 43, 43] total 86 [2018-10-22 16:10:08,838 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:08,839 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-10-22 16:10:08,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-10-22 16:10:08,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1162, Invalid=6148, Unknown=0, NotChecked=0, Total=7310 [2018-10-22 16:10:08,839 INFO L87 Difference]: Start difference. First operand 202 states and 203 transitions. Second operand 66 states. [2018-10-22 16:10:11,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:11,308 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2018-10-22 16:10:11,308 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-22 16:10:11,309 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 199 [2018-10-22 16:10:11,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:11,310 INFO L225 Difference]: With dead ends: 217 [2018-10-22 16:10:11,310 INFO L226 Difference]: Without dead ends: 215 [2018-10-22 16:10:11,312 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 880 GetRequests, 716 SyntacticMatches, 40 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6624 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=2844, Invalid=12906, Unknown=0, NotChecked=0, Total=15750 [2018-10-22 16:10:11,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-10-22 16:10:11,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 210. [2018-10-22 16:10:11,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-10-22 16:10:11,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 211 transitions. [2018-10-22 16:10:11,323 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 211 transitions. Word has length 199 [2018-10-22 16:10:11,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:11,324 INFO L481 AbstractCegarLoop]: Abstraction has 210 states and 211 transitions. [2018-10-22 16:10:11,324 INFO L482 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-10-22 16:10:11,324 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 211 transitions. [2018-10-22 16:10:11,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-10-22 16:10:11,325 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:11,325 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:11,326 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:11,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:11,326 INFO L82 PathProgramCache]: Analyzing trace with hash -1746469383, now seen corresponding path program 37 times [2018-10-22 16:10:11,326 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:11,326 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:11,327 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:10:11,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:11,327 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:11,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:13,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 721 proven. 532 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:10:13,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:13,486 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:13,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:13,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:13,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:13,487 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:13,495 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:13,495 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:13,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:13,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:16,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 37 proven. 1216 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:10:16,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:20,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 37 proven. 1216 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:10:20,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:20,662 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 79 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 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:10:20,677 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:20,677 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:10:20,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:20,810 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:21,168 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 38 proven. 1161 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:10:21,168 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:10:21,608 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 38 proven. 1161 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:10:21,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:10:21,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48, 47, 46] total 135 [2018-10-22 16:10:21,610 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:10:21,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-10-22 16:10:21,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-10-22 16:10:21,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2283, Invalid=15807, Unknown=0, NotChecked=0, Total=18090 [2018-10-22 16:10:21,612 INFO L87 Difference]: Start difference. First operand 210 states and 211 transitions. Second operand 90 states. [2018-10-22 16:10:25,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:10:25,818 INFO L93 Difference]: Finished difference Result 385 states and 390 transitions. [2018-10-22 16:10:25,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-22 16:10:25,818 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 207 [2018-10-22 16:10:25,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:10:25,820 INFO L225 Difference]: With dead ends: 385 [2018-10-22 16:10:25,820 INFO L226 Difference]: Without dead ends: 222 [2018-10-22 16:10:25,822 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 900 GetRequests, 732 SyntacticMatches, 11 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8108 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=3157, Invalid=21965, Unknown=0, NotChecked=0, Total=25122 [2018-10-22 16:10:25,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-10-22 16:10:25,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 212. [2018-10-22 16:10:25,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 212 states. [2018-10-22 16:10:25,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 213 transitions. [2018-10-22 16:10:25,837 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 213 transitions. Word has length 207 [2018-10-22 16:10:25,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:10:25,837 INFO L481 AbstractCegarLoop]: Abstraction has 212 states and 213 transitions. [2018-10-22 16:10:25,837 INFO L482 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-10-22 16:10:25,837 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 213 transitions. [2018-10-22 16:10:25,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-10-22 16:10:25,839 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:10:25,839 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:10:25,839 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:10:25,839 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:10:25,840 INFO L82 PathProgramCache]: Analyzing trace with hash -50942989, now seen corresponding path program 38 times [2018-10-22 16:10:25,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:10:25,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:25,840 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:10:25,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:10:25,841 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:10:25,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:10:28,814 INFO L134 CoverageAnalysis]: Checked inductivity of 1925 backedges. 457 proven. 838 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-22 16:10:28,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:28,814 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:10:28,814 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:10:28,814 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:10:28,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:10:28,815 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:28,821 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:10:28,822 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:10:28,884 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:10:28,884 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:10:28,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:10:29,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1925 backedges. 38 proven. 1203 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-22 16:10:29,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-10-22 16:10:30,066 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-10-22 16:10:30,267 WARN L522 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:10:30,267 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-22 16:10:30,273 WARN L205 ceAbstractionStarter]: Timeout [2018-10-22 16:10:30,274 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 04:10:30 BoogieIcfgContainer [2018-10-22 16:10:30,274 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 16:10:30,274 INFO L168 Benchmark]: Toolchain (without parser) took 231787.53 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 821.6 MB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -181.7 MB). Peak memory consumption was 639.9 MB. Max. memory is 7.1 GB. [2018-10-22 16:10:30,275 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:10:30,276 INFO L168 Benchmark]: CACSL2BoogieTranslator took 262.47 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-22 16:10:30,276 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.94 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:10:30,277 INFO L168 Benchmark]: Boogie Preprocessor took 26.49 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-22 16:10:30,277 INFO L168 Benchmark]: RCFGBuilder took 549.17 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 761.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -799.7 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-10-22 16:10:30,278 INFO L168 Benchmark]: TraceAbstraction took 230920.21 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 60.3 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 607.4 MB). Peak memory consumption was 667.7 MB. Max. memory is 7.1 GB. [2018-10-22 16:10:30,286 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 262.47 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.94 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.49 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 549.17 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 761.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -799.7 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 230920.21 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 60.3 MB). Free memory was 2.2 GB in the beginning and 1.6 GB in the end (delta: 607.4 MB). Peak memory consumption was 667.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 210 with TraceHistMax 22,while TraceCheckSpWp was constructing backward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 69 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. TIMEOUT Result, 230.8s OverallTime, 42 OverallIterations, 22 TraceHistogramMax, 66.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 1281 SDtfs, 4880 SDslu, 32508 SDs, 0 SdLazy, 47916 SolverSat, 4541 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 34.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19032 GetRequests, 15073 SyntacticMatches, 641 SemanticMatches, 3318 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142181 ImplicationChecksByTransitivity, 158.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=212occurred in iteration=41, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.0s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 41 MinimizatonAttempts, 215 StatesRemovedByMinimization, 31 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.5s SsaConstructionTime, 8.0s SatisfiabilityAnalysisTime, 146.5s InterpolantComputationTime, 12962 NumberOfCodeBlocks, 12962 NumberOfCodeBlocksAsserted, 559 NumberOfCheckSat, 21387 ConstructedInterpolants, 0 QuantifiedInterpolants, 22805665 SizeOfPredicates, 377 NumberOfNonLiveVariables, 18510 ConjunctsInSsa, 3574 ConjunctsInUnsatCore, 197 InterpolantComputations, 2 PerfectInterpolantSequences, 51267/124175 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown