java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_range_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-07 10:56:19,631 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-07 10:56:19,633 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-07 10:56:19,653 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-07 10:56:19,654 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-07 10:56:19,655 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-07 10:56:19,658 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-07 10:56:19,667 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-07 10:56:19,672 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-07 10:56:19,676 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-07 10:56:19,678 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-07 10:56:19,680 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-07 10:56:19,680 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-07 10:56:19,682 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-07 10:56:19,684 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-07 10:56:19,686 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-07 10:56:19,687 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-07 10:56:19,689 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-07 10:56:19,691 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-07 10:56:19,696 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-07 10:56:19,700 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-07 10:56:19,702 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-07 10:56:19,704 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-07 10:56:19,706 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-07 10:56:19,708 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-07 10:56:19,720 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-07 10:56:19,721 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-07 10:56:19,722 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-07 10:56:19,723 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-09-07 10:56:19,759 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-07 10:56:19,760 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-07 10:56:19,761 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-07 10:56:19,764 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-07 10:56:19,765 INFO L138 SettingsManager]: * Use SBE=true [2019-09-07 10:56:19,765 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-07 10:56:19,765 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-07 10:56:19,765 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-07 10:56:19,765 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-07 10:56:19,766 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-07 10:56:19,766 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-07 10:56:19,766 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-07 10:56:19,766 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-07 10:56:19,766 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-07 10:56:19,767 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-07 10:56:19,767 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-07 10:56:19,767 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-07 10:56:19,770 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-07 10:56:19,770 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-07 10:56:19,770 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-07 10:56:19,771 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-07 10:56:19,771 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-07 10:56:19,771 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-07 10:56:19,771 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-07 10:56:19,771 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-07 10:56:19,772 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-07 10:56:19,772 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-07 10:56:19,772 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-07 10:56:19,772 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-07 10:56:19,825 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-07 10:56:19,845 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-07 10:56:19,851 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-07 10:56:19,853 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-07 10:56:19,853 INFO L275 PluginConnector]: CDTParser initialized [2019-09-07 10:56:19,854 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_range_init.i [2019-09-07 10:56:19,920 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f19a4ddd5/149744b62d914f159642d69a0b27c1fc/FLAG1af9168b2 [2019-09-07 10:56:20,419 INFO L306 CDTParser]: Found 1 translation units. [2019-09-07 10:56:20,420 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-industry-pattern/array_range_init.i [2019-09-07 10:56:20,426 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f19a4ddd5/149744b62d914f159642d69a0b27c1fc/FLAG1af9168b2 [2019-09-07 10:56:20,795 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f19a4ddd5/149744b62d914f159642d69a0b27c1fc [2019-09-07 10:56:20,808 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-07 10:56:20,809 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-07 10:56:20,811 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-07 10:56:20,811 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-07 10:56:20,816 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-07 10:56:20,817 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.09 10:56:20" (1/1) ... [2019-09-07 10:56:20,821 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7326b1cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:20, skipping insertion in model container [2019-09-07 10:56:20,821 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.09 10:56:20" (1/1) ... [2019-09-07 10:56:20,830 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-07 10:56:20,852 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-07 10:56:21,091 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-07 10:56:21,102 INFO L188 MainTranslator]: Completed pre-run [2019-09-07 10:56:21,128 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-07 10:56:21,252 INFO L192 MainTranslator]: Completed translation [2019-09-07 10:56:21,252 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21 WrapperNode [2019-09-07 10:56:21,253 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-07 10:56:21,254 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-07 10:56:21,254 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-07 10:56:21,254 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-07 10:56:21,268 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21" (1/1) ... [2019-09-07 10:56:21,268 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21" (1/1) ... [2019-09-07 10:56:21,277 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21" (1/1) ... [2019-09-07 10:56:21,278 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21" (1/1) ... [2019-09-07 10:56:21,286 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21" (1/1) ... [2019-09-07 10:56:21,295 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21" (1/1) ... [2019-09-07 10:56:21,296 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21" (1/1) ... [2019-09-07 10:56:21,298 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-07 10:56:21,299 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-07 10:56:21,299 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-07 10:56:21,299 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-07 10:56:21,300 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-07 10:56:21,369 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-07 10:56:21,369 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-07 10:56:21,370 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-07 10:56:21,370 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-07 10:56:21,370 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-07 10:56:21,370 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-07 10:56:21,370 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-07 10:56:21,370 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-09-07 10:56:21,370 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-09-07 10:56:21,371 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-07 10:56:21,371 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-09-07 10:56:21,371 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-07 10:56:21,371 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-09-07 10:56:21,617 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-07 10:56:21,618 INFO L283 CfgBuilder]: Removed 2 assume(true) statements. [2019-09-07 10:56:21,619 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.09 10:56:21 BoogieIcfgContainer [2019-09-07 10:56:21,628 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-07 10:56:21,629 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-07 10:56:21,630 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-07 10:56:21,637 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-07 10:56:21,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.09 10:56:20" (1/3) ... [2019-09-07 10:56:21,641 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1474492f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.09 10:56:21, skipping insertion in model container [2019-09-07 10:56:21,644 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.09 10:56:21" (2/3) ... [2019-09-07 10:56:21,644 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1474492f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.09 10:56:21, skipping insertion in model container [2019-09-07 10:56:21,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.09 10:56:21" (3/3) ... [2019-09-07 10:56:21,649 INFO L109 eAbstractionObserver]: Analyzing ICFG array_range_init.i [2019-09-07 10:56:21,673 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-07 10:56:21,681 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-07 10:56:21,699 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-07 10:56:21,730 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-07 10:56:21,731 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-07 10:56:21,731 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-07 10:56:21,731 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-07 10:56:21,732 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-07 10:56:21,732 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-07 10:56:21,732 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-07 10:56:21,732 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-07 10:56:21,732 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-07 10:56:21,752 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-09-07 10:56:21,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-07 10:56:21,757 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:21,758 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:21,760 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:21,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:21,765 INFO L82 PathProgramCache]: Analyzing trace with hash -132821438, now seen corresponding path program 1 times [2019-09-07 10:56:21,767 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:21,767 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:21,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:21,812 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:21,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:21,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:21,897 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:21,900 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-07 10:56:21,900 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-07 10:56:21,903 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-07 10:56:21,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-07 10:56:21,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-07 10:56:21,917 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2019-09-07 10:56:21,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:21,937 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2019-09-07 10:56:21,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-07 10:56:21,938 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2019-09-07 10:56:21,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:21,946 INFO L225 Difference]: With dead ends: 41 [2019-09-07 10:56:21,946 INFO L226 Difference]: Without dead ends: 20 [2019-09-07 10:56:21,950 INFO L628 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 [2019-09-07 10:56:21,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-09-07 10:56:21,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-09-07 10:56:21,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-09-07 10:56:21,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-09-07 10:56:21,988 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 13 [2019-09-07 10:56:21,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:21,989 INFO L475 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-09-07 10:56:21,989 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-07 10:56:21,990 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-09-07 10:56:21,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-07 10:56:21,990 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:21,990 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:21,991 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:21,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:21,991 INFO L82 PathProgramCache]: Analyzing trace with hash -1305427337, now seen corresponding path program 1 times [2019-09-07 10:56:21,991 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:21,992 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:21,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:21,993 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:21,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:22,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:22,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:22,050 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-07 10:56:22,051 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-09-07 10:56:22,052 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-07 10:56:22,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-07 10:56:22,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-07 10:56:22,053 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 3 states. [2019-09-07 10:56:22,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:22,139 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2019-09-07 10:56:22,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-07 10:56:22,141 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-09-07 10:56:22,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:22,143 INFO L225 Difference]: With dead ends: 41 [2019-09-07 10:56:22,144 INFO L226 Difference]: Without dead ends: 27 [2019-09-07 10:56:22,145 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-07 10:56:22,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-09-07 10:56:22,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 22. [2019-09-07 10:56:22,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-09-07 10:56:22,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-09-07 10:56:22,158 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2019-09-07 10:56:22,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:22,158 INFO L475 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-09-07 10:56:22,159 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-07 10:56:22,159 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-09-07 10:56:22,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-07 10:56:22,160 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:22,160 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:22,160 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:22,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:22,161 INFO L82 PathProgramCache]: Analyzing trace with hash -11566460, now seen corresponding path program 1 times [2019-09-07 10:56:22,161 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:22,161 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:22,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:22,164 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:22,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:22,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:22,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:22,255 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-07 10:56:22,255 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-09-07 10:56:22,256 INFO L454 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-09-07 10:56:22,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-09-07 10:56:22,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-09-07 10:56:22,257 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2019-09-07 10:56:22,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:22,326 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2019-09-07 10:56:22,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-07 10:56:22,326 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-09-07 10:56:22,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:22,327 INFO L225 Difference]: With dead ends: 45 [2019-09-07 10:56:22,328 INFO L226 Difference]: Without dead ends: 34 [2019-09-07 10:56:22,328 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-09-07 10:56:22,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-09-07 10:56:22,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 24. [2019-09-07 10:56:22,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-09-07 10:56:22,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-09-07 10:56:22,336 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 16 [2019-09-07 10:56:22,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:22,336 INFO L475 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-09-07 10:56:22,336 INFO L476 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-09-07 10:56:22,336 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-09-07 10:56:22,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-09-07 10:56:22,337 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:22,338 INFO L399 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:22,338 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:22,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:22,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1253602983, now seen corresponding path program 1 times [2019-09-07 10:56:22,339 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:22,339 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:22,340 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:22,340 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:22,341 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:22,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:22,414 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:22,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:22,415 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:22,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:22,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:22,481 INFO L256 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2019-09-07 10:56:22,488 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:22,511 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (2)] Exception during sending of exit command (exit): Broken pipe [2019-09-07 10:56:22,517 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:22,517 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2019-09-07 10:56:22,518 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-07 10:56:22,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-07 10:56:22,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-09-07 10:56:22,521 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2019-09-07 10:56:22,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:22,594 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2019-09-07 10:56:22,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-07 10:56:22,595 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2019-09-07 10:56:22,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:22,597 INFO L225 Difference]: With dead ends: 52 [2019-09-07 10:56:22,598 INFO L226 Difference]: Without dead ends: 41 [2019-09-07 10:56:22,598 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-09-07 10:56:22,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-09-07 10:56:22,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 27. [2019-09-07 10:56:22,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-09-07 10:56:22,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-09-07 10:56:22,606 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 19 [2019-09-07 10:56:22,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:22,606 INFO L475 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-09-07 10:56:22,606 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-07 10:56:22,607 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-09-07 10:56:22,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-07 10:56:22,608 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:22,608 INFO L399 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:22,608 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:22,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:22,609 INFO L82 PathProgramCache]: Analyzing trace with hash -1620404636, now seen corresponding path program 2 times [2019-09-07 10:56:22,609 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:22,609 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:22,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:22,610 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:22,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:22,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:22,697 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:22,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:22,698 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:22,727 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-07 10:56:22,764 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-07 10:56:22,765 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:22,766 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-07 10:56:22,770 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:22,785 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:22,789 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:22,789 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2019-09-07 10:56:22,791 INFO L454 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-09-07 10:56:22,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-09-07 10:56:22,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-09-07 10:56:22,792 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 6 states. [2019-09-07 10:56:22,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:22,894 INFO L93 Difference]: Finished difference Result 59 states and 69 transitions. [2019-09-07 10:56:22,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-07 10:56:22,895 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2019-09-07 10:56:22,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:22,896 INFO L225 Difference]: With dead ends: 59 [2019-09-07 10:56:22,897 INFO L226 Difference]: Without dead ends: 48 [2019-09-07 10:56:22,897 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-09-07 10:56:22,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-09-07 10:56:22,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 30. [2019-09-07 10:56:22,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-09-07 10:56:22,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2019-09-07 10:56:22,905 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 22 [2019-09-07 10:56:22,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:22,906 INFO L475 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2019-09-07 10:56:22,906 INFO L476 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-09-07 10:56:22,906 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2019-09-07 10:56:22,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-09-07 10:56:22,907 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:22,907 INFO L399 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:22,908 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:22,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:22,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1683319161, now seen corresponding path program 3 times [2019-09-07 10:56:22,908 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:22,908 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:22,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:22,910 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:22,910 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:22,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:23,023 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:23,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:23,024 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:23,041 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-07 10:56:23,069 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-09-07 10:56:23,070 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:23,070 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 6 conjunts are in the unsatisfiable core [2019-09-07 10:56:23,072 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:23,080 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:23,092 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:23,092 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2019-09-07 10:56:23,092 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-07 10:56:23,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-07 10:56:23,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-09-07 10:56:23,093 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 7 states. [2019-09-07 10:56:23,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:23,195 INFO L93 Difference]: Finished difference Result 66 states and 78 transitions. [2019-09-07 10:56:23,195 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-07 10:56:23,195 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2019-09-07 10:56:23,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:23,197 INFO L225 Difference]: With dead ends: 66 [2019-09-07 10:56:23,197 INFO L226 Difference]: Without dead ends: 55 [2019-09-07 10:56:23,198 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-09-07 10:56:23,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-09-07 10:56:23,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 33. [2019-09-07 10:56:23,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-09-07 10:56:23,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2019-09-07 10:56:23,205 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 25 [2019-09-07 10:56:23,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:23,205 INFO L475 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2019-09-07 10:56:23,205 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-07 10:56:23,206 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2019-09-07 10:56:23,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-09-07 10:56:23,206 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:23,207 INFO L399 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:23,207 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:23,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:23,207 INFO L82 PathProgramCache]: Analyzing trace with hash -551599548, now seen corresponding path program 4 times [2019-09-07 10:56:23,208 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:23,208 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:23,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:23,209 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:23,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:23,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:23,331 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:23,332 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:23,332 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:23,350 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-07 10:56:23,373 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-07 10:56:23,374 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:23,375 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-07 10:56:23,377 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:23,386 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:23,390 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:23,391 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2019-09-07 10:56:23,391 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-07 10:56:23,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-07 10:56:23,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-09-07 10:56:23,392 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand 8 states. [2019-09-07 10:56:23,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:23,510 INFO L93 Difference]: Finished difference Result 73 states and 87 transitions. [2019-09-07 10:56:23,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-07 10:56:23,511 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2019-09-07 10:56:23,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:23,512 INFO L225 Difference]: With dead ends: 73 [2019-09-07 10:56:23,512 INFO L226 Difference]: Without dead ends: 62 [2019-09-07 10:56:23,513 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-09-07 10:56:23,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-09-07 10:56:23,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 36. [2019-09-07 10:56:23,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-09-07 10:56:23,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2019-09-07 10:56:23,520 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 28 [2019-09-07 10:56:23,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:23,521 INFO L475 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2019-09-07 10:56:23,521 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-07 10:56:23,521 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2019-09-07 10:56:23,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-09-07 10:56:23,522 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:23,522 INFO L399 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:23,523 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:23,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:23,523 INFO L82 PathProgramCache]: Analyzing trace with hash -431836775, now seen corresponding path program 5 times [2019-09-07 10:56:23,523 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:23,524 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:23,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:23,525 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:23,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:23,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:23,617 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:23,618 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:23,618 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-07 10:56:23,647 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:23,683 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-09-07 10:56:23,683 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:23,684 INFO L256 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-07 10:56:23,687 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:23,724 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-09-07 10:56:23,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:23,729 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2019-09-07 10:56:23,729 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-07 10:56:23,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-07 10:56:23,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=68, Unknown=0, NotChecked=0, Total=132 [2019-09-07 10:56:23,731 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand 12 states. [2019-09-07 10:56:23,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:23,918 INFO L93 Difference]: Finished difference Result 125 states and 156 transitions. [2019-09-07 10:56:23,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-09-07 10:56:23,919 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2019-09-07 10:56:23,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:23,920 INFO L225 Difference]: With dead ends: 125 [2019-09-07 10:56:23,920 INFO L226 Difference]: Without dead ends: 97 [2019-09-07 10:56:23,921 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=64, Invalid=68, Unknown=0, NotChecked=0, Total=132 [2019-09-07 10:56:23,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2019-09-07 10:56:23,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 45. [2019-09-07 10:56:23,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-09-07 10:56:23,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2019-09-07 10:56:23,929 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 31 [2019-09-07 10:56:23,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:23,930 INFO L475 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2019-09-07 10:56:23,930 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-07 10:56:23,930 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2019-09-07 10:56:23,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-09-07 10:56:23,931 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:23,932 INFO L399 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:23,932 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:23,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:23,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1332614844, now seen corresponding path program 6 times [2019-09-07 10:56:23,932 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:23,933 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:23,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:23,934 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:23,934 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:23,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:24,036 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 53 proven. 57 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-09-07 10:56:24,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:24,037 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:24,054 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-07 10:56:24,102 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2019-09-07 10:56:24,103 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:24,104 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2019-09-07 10:56:24,107 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:24,157 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 62 proven. 15 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-09-07 10:56:24,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:24,164 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 15 [2019-09-07 10:56:24,164 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-07 10:56:24,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-07 10:56:24,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=111, Unknown=0, NotChecked=0, Total=210 [2019-09-07 10:56:24,165 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 15 states. [2019-09-07 10:56:24,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:24,486 INFO L93 Difference]: Finished difference Result 158 states and 198 transitions. [2019-09-07 10:56:24,487 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-09-07 10:56:24,487 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 40 [2019-09-07 10:56:24,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:24,488 INFO L225 Difference]: With dead ends: 158 [2019-09-07 10:56:24,489 INFO L226 Difference]: Without dead ends: 124 [2019-09-07 10:56:24,490 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=156, Invalid=186, Unknown=0, NotChecked=0, Total=342 [2019-09-07 10:56:24,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-09-07 10:56:24,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 57. [2019-09-07 10:56:24,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-09-07 10:56:24,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2019-09-07 10:56:24,508 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 40 [2019-09-07 10:56:24,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:24,509 INFO L475 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2019-09-07 10:56:24,509 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-07 10:56:24,510 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2019-09-07 10:56:24,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-09-07 10:56:24,515 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:24,515 INFO L399 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:24,515 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:24,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:24,516 INFO L82 PathProgramCache]: Analyzing trace with hash 2054278009, now seen corresponding path program 7 times [2019-09-07 10:56:24,520 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:24,520 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:24,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:24,522 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:24,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:24,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:24,676 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 107 proven. 77 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-09-07 10:56:24,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:24,677 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:24,698 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:24,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:24,723 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 14 conjunts are in the unsatisfiable core [2019-09-07 10:56:24,726 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:24,825 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 23 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:24,829 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:24,829 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 15 [2019-09-07 10:56:24,830 INFO L454 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-09-07 10:56:24,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-09-07 10:56:24,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2019-09-07 10:56:24,830 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand 15 states. [2019-09-07 10:56:25,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:25,045 INFO L93 Difference]: Finished difference Result 171 states and 216 transitions. [2019-09-07 10:56:25,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-09-07 10:56:25,045 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 49 [2019-09-07 10:56:25,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:25,047 INFO L225 Difference]: With dead ends: 171 [2019-09-07 10:56:25,047 INFO L226 Difference]: Without dead ends: 160 [2019-09-07 10:56:25,048 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2019-09-07 10:56:25,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2019-09-07 10:56:25,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 72. [2019-09-07 10:56:25,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-09-07 10:56:25,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2019-09-07 10:56:25,059 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 49 [2019-09-07 10:56:25,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:25,059 INFO L475 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2019-09-07 10:56:25,060 INFO L476 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-09-07 10:56:25,060 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2019-09-07 10:56:25,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-09-07 10:56:25,061 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:25,061 INFO L399 BasicCegarLoop]: trace histogram [17, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:25,061 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:25,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:25,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1776336900, now seen corresponding path program 8 times [2019-09-07 10:56:25,062 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:25,062 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:25,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:25,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:25,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:25,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:25,252 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 177 proven. 222 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-09-07 10:56:25,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:25,253 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:25,284 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-07 10:56:25,321 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-07 10:56:25,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:25,322 INFO L256 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 19 conjunts are in the unsatisfiable core [2019-09-07 10:56:25,326 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:25,450 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 33 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:25,460 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:25,460 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 20 [2019-09-07 10:56:25,460 INFO L454 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-09-07 10:56:25,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-09-07 10:56:25,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-09-07 10:56:25,463 INFO L87 Difference]: Start difference. First operand 72 states and 87 transitions. Second operand 20 states. [2019-09-07 10:56:25,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:25,726 INFO L93 Difference]: Finished difference Result 221 states and 281 transitions. [2019-09-07 10:56:25,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-09-07 10:56:25,726 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 64 [2019-09-07 10:56:25,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:25,728 INFO L225 Difference]: With dead ends: 221 [2019-09-07 10:56:25,728 INFO L226 Difference]: Without dead ends: 210 [2019-09-07 10:56:25,729 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2019-09-07 10:56:25,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2019-09-07 10:56:25,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 87. [2019-09-07 10:56:25,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2019-09-07 10:56:25,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 107 transitions. [2019-09-07 10:56:25,740 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 107 transitions. Word has length 64 [2019-09-07 10:56:25,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:25,741 INFO L475 AbstractCegarLoop]: Abstraction has 87 states and 107 transitions. [2019-09-07 10:56:25,741 INFO L476 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-09-07 10:56:25,741 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 107 transitions. [2019-09-07 10:56:25,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-09-07 10:56:25,742 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:25,742 INFO L399 BasicCegarLoop]: trace histogram [22, 22, 17, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:25,743 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:25,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:25,743 INFO L82 PathProgramCache]: Analyzing trace with hash 1918813209, now seen corresponding path program 9 times [2019-09-07 10:56:25,743 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:25,743 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:25,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:25,745 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:25,745 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:25,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:25,998 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 247 proven. 442 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-09-07 10:56:25,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:25,998 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-07 10:56:26,018 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:26,414 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2019-09-07 10:56:26,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:26,416 INFO L256 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-07 10:56:26,425 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:26,506 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 283 proven. 40 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-09-07 10:56:26,511 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:26,511 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 8] total 27 [2019-09-07 10:56:26,512 INFO L454 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-09-07 10:56:26,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-09-07 10:56:26,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=336, Invalid=366, Unknown=0, NotChecked=0, Total=702 [2019-09-07 10:56:26,514 INFO L87 Difference]: Start difference. First operand 87 states and 107 transitions. Second operand 27 states. [2019-09-07 10:56:27,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:27,042 INFO L93 Difference]: Finished difference Result 321 states and 407 transitions. [2019-09-07 10:56:27,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-09-07 10:56:27,043 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 79 [2019-09-07 10:56:27,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:27,045 INFO L225 Difference]: With dead ends: 321 [2019-09-07 10:56:27,045 INFO L226 Difference]: Without dead ends: 245 [2019-09-07 10:56:27,047 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=336, Invalid=366, Unknown=0, NotChecked=0, Total=702 [2019-09-07 10:56:27,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2019-09-07 10:56:27,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 93. [2019-09-07 10:56:27,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-09-07 10:56:27,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 113 transitions. [2019-09-07 10:56:27,058 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 113 transitions. Word has length 79 [2019-09-07 10:56:27,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:27,059 INFO L475 AbstractCegarLoop]: Abstraction has 93 states and 113 transitions. [2019-09-07 10:56:27,059 INFO L476 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-09-07 10:56:27,059 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 113 transitions. [2019-09-07 10:56:27,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-09-07 10:56:27,060 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:27,060 INFO L399 BasicCegarLoop]: trace histogram [25, 25, 18, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:27,061 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:27,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:27,061 INFO L82 PathProgramCache]: Analyzing trace with hash 186648260, now seen corresponding path program 10 times [2019-09-07 10:56:27,061 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:27,061 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:27,062 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:27,062 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:27,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:27,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:27,369 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 373 proven. 495 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-09-07 10:56:27,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:27,370 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:27,383 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-07 10:56:27,420 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-07 10:56:27,420 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:27,421 INFO L256 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 27 conjunts are in the unsatisfiable core [2019-09-07 10:56:27,425 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:27,593 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 49 proven. 876 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (11)] Exception during sending of exit command (exit): Broken pipe [2019-09-07 10:56:27,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:27,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 28] total 28 [2019-09-07 10:56:27,599 INFO L454 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-09-07 10:56:27,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-09-07 10:56:27,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-09-07 10:56:27,600 INFO L87 Difference]: Start difference. First operand 93 states and 113 transitions. Second operand 28 states. [2019-09-07 10:56:28,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:28,131 INFO L93 Difference]: Finished difference Result 284 states and 362 transitions. [2019-09-07 10:56:28,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-09-07 10:56:28,132 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 88 [2019-09-07 10:56:28,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:28,135 INFO L225 Difference]: With dead ends: 284 [2019-09-07 10:56:28,136 INFO L226 Difference]: Without dead ends: 273 [2019-09-07 10:56:28,137 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2019-09-07 10:56:28,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2019-09-07 10:56:28,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 111. [2019-09-07 10:56:28,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-09-07 10:56:28,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 137 transitions. [2019-09-07 10:56:28,167 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 137 transitions. Word has length 88 [2019-09-07 10:56:28,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:28,168 INFO L475 AbstractCegarLoop]: Abstraction has 111 states and 137 transitions. [2019-09-07 10:56:28,168 INFO L476 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-09-07 10:56:28,168 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 137 transitions. [2019-09-07 10:56:28,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-09-07 10:56:28,169 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:28,169 INFO L399 BasicCegarLoop]: trace histogram [31, 31, 25, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:28,169 INFO L418 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:28,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:28,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1486759526, now seen corresponding path program 11 times [2019-09-07 10:56:28,170 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:28,170 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:28,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:28,171 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:28,171 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:28,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:28,640 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 436 proven. 950 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-09-07 10:56:28,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:28,640 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:28,662 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-07 10:56:29,577 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 32 check-sat command(s) [2019-09-07 10:56:29,577 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:29,580 INFO L256 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 10 conjunts are in the unsatisfiable core [2019-09-07 10:56:29,583 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:29,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 57 refuted. 0 times theorem prover too weak. 876 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (12)] Exception during sending of exit command (exit): Broken pipe [2019-09-07 10:56:29,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:29,674 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 10] total 37 [2019-09-07 10:56:29,674 INFO L454 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-09-07 10:56:29,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-09-07 10:56:29,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=654, Invalid=678, Unknown=0, NotChecked=0, Total=1332 [2019-09-07 10:56:29,676 INFO L87 Difference]: Start difference. First operand 111 states and 137 transitions. Second operand 37 states. [2019-09-07 10:56:30,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:30,566 INFO L93 Difference]: Finished difference Result 432 states and 552 transitions. [2019-09-07 10:56:30,567 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-09-07 10:56:30,567 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 106 [2019-09-07 10:56:30,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:30,570 INFO L225 Difference]: With dead ends: 432 [2019-09-07 10:56:30,570 INFO L226 Difference]: Without dead ends: 344 [2019-09-07 10:56:30,571 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=907, Invalid=985, Unknown=0, NotChecked=0, Total=1892 [2019-09-07 10:56:30,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2019-09-07 10:56:30,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 123. [2019-09-07 10:56:30,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2019-09-07 10:56:30,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 152 transitions. [2019-09-07 10:56:30,583 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 152 transitions. Word has length 106 [2019-09-07 10:56:30,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:30,584 INFO L475 AbstractCegarLoop]: Abstraction has 123 states and 152 transitions. [2019-09-07 10:56:30,584 INFO L476 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-09-07 10:56:30,584 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 152 transitions. [2019-09-07 10:56:30,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-09-07 10:56:30,585 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:30,585 INFO L399 BasicCegarLoop]: trace histogram [34, 34, 26, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:30,585 INFO L418 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:30,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:30,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1045157097, now seen corresponding path program 12 times [2019-09-07 10:56:30,586 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:30,586 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:30,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:30,587 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:30,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:30,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:31,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 613 proven. 1027 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2019-09-07 10:56:31,021 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:31,021 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:31,033 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-07 10:56:50,938 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 34 check-sat command(s) [2019-09-07 10:56:50,939 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:50,963 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 18 conjunts are in the unsatisfiable core [2019-09-07 10:56:50,965 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:51,133 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 793 proven. 187 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2019-09-07 10:56:51,152 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:51,153 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 15] total 43 [2019-09-07 10:56:51,154 INFO L454 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-09-07 10:56:51,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-09-07 10:56:51,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=854, Invalid=952, Unknown=0, NotChecked=0, Total=1806 [2019-09-07 10:56:51,156 INFO L87 Difference]: Start difference. First operand 123 states and 152 transitions. Second operand 43 states. [2019-09-07 10:56:52,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:52,289 INFO L93 Difference]: Finished difference Result 507 states and 644 transitions. [2019-09-07 10:56:52,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-09-07 10:56:52,290 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 115 [2019-09-07 10:56:52,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:52,293 INFO L225 Difference]: With dead ends: 507 [2019-09-07 10:56:52,293 INFO L226 Difference]: Without dead ends: 395 [2019-09-07 10:56:52,295 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1254 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1440, Invalid=1866, Unknown=0, NotChecked=0, Total=3306 [2019-09-07 10:56:52,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2019-09-07 10:56:52,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 141. [2019-09-07 10:56:52,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-09-07 10:56:52,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 171 transitions. [2019-09-07 10:56:52,308 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 171 transitions. Word has length 115 [2019-09-07 10:56:52,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:52,308 INFO L475 AbstractCegarLoop]: Abstraction has 141 states and 171 transitions. [2019-09-07 10:56:52,309 INFO L476 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-09-07 10:56:52,309 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 171 transitions. [2019-09-07 10:56:52,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2019-09-07 10:56:52,311 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:52,311 INFO L399 BasicCegarLoop]: trace histogram [40, 40, 27, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:52,311 INFO L418 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:52,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:52,312 INFO L82 PathProgramCache]: Analyzing trace with hash 718247993, now seen corresponding path program 13 times [2019-09-07 10:56:52,312 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:52,312 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:52,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:52,313 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:52,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:52,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:52,765 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1051 proven. 1107 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-09-07 10:56:52,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:52,765 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:52,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:52,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:52,838 INFO L256 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 42 conjunts are in the unsatisfiable core [2019-09-07 10:56:52,842 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:53,422 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 79 proven. 2301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:53,436 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:53,436 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 43] total 43 [2019-09-07 10:56:53,439 INFO L454 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-09-07 10:56:53,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-09-07 10:56:53,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2019-09-07 10:56:53,448 INFO L87 Difference]: Start difference. First operand 141 states and 171 transitions. Second operand 43 states. [2019-09-07 10:56:54,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:54,355 INFO L93 Difference]: Finished difference Result 475 states and 612 transitions. [2019-09-07 10:56:54,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2019-09-07 10:56:54,356 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 133 [2019-09-07 10:56:54,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:54,359 INFO L225 Difference]: With dead ends: 475 [2019-09-07 10:56:54,359 INFO L226 Difference]: Without dead ends: 464 [2019-09-07 10:56:54,362 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2019-09-07 10:56:54,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2019-09-07 10:56:54,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 180. [2019-09-07 10:56:54,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2019-09-07 10:56:54,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 223 transitions. [2019-09-07 10:56:54,382 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 223 transitions. Word has length 133 [2019-09-07 10:56:54,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:54,384 INFO L475 AbstractCegarLoop]: Abstraction has 180 states and 223 transitions. [2019-09-07 10:56:54,384 INFO L476 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-09-07 10:56:54,384 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 223 transitions. [2019-09-07 10:56:54,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2019-09-07 10:56:54,386 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:54,386 INFO L399 BasicCegarLoop]: trace histogram [53, 53, 40, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:54,387 INFO L418 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:54,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:54,387 INFO L82 PathProgramCache]: Analyzing trace with hash -905479484, now seen corresponding path program 14 times [2019-09-07 10:56:54,387 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:54,387 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:54,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:54,388 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 10:56:54,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:54,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:55,400 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1545 proven. 2420 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-09-07 10:56:55,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:55,401 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-07 10:56:55,416 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:55,475 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-07 10:56:55,475 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:56:55,477 INFO L256 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 55 conjunts are in the unsatisfiable core [2019-09-07 10:56:55,480 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:56:55,963 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 105 proven. 4082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:56:55,966 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:56:55,967 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 56] total 56 [2019-09-07 10:56:55,967 INFO L454 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-09-07 10:56:55,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-09-07 10:56:55,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2019-09-07 10:56:55,969 INFO L87 Difference]: Start difference. First operand 180 states and 223 transitions. Second operand 56 states. [2019-09-07 10:56:57,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:56:57,621 INFO L93 Difference]: Finished difference Result 605 states and 781 transitions. [2019-09-07 10:56:57,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2019-09-07 10:56:57,623 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 172 [2019-09-07 10:56:57,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:56:57,627 INFO L225 Difference]: With dead ends: 605 [2019-09-07 10:56:57,627 INFO L226 Difference]: Without dead ends: 594 [2019-09-07 10:56:57,629 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1540, Invalid=1540, Unknown=0, NotChecked=0, Total=3080 [2019-09-07 10:56:57,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2019-09-07 10:56:57,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 219. [2019-09-07 10:56:57,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2019-09-07 10:56:57,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 275 transitions. [2019-09-07 10:56:57,648 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 275 transitions. Word has length 172 [2019-09-07 10:56:57,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:56:57,649 INFO L475 AbstractCegarLoop]: Abstraction has 219 states and 275 transitions. [2019-09-07 10:56:57,649 INFO L476 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-09-07 10:56:57,649 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 275 transitions. [2019-09-07 10:56:57,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2019-09-07 10:56:57,652 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:56:57,653 INFO L399 BasicCegarLoop]: trace histogram [66, 66, 53, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:56:57,653 INFO L418 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:56:57,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:56:57,653 INFO L82 PathProgramCache]: Analyzing trace with hash -958979623, now seen corresponding path program 15 times [2019-09-07 10:56:57,654 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:56:57,654 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:56:57,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:57,655 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:56:57,655 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:56:57,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:56:59,281 INFO L134 CoverageAnalysis]: Checked inductivity of 6501 backedges. 2039 proven. 4240 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-09-07 10:56:59,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:56:59,281 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:56:59,293 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-07 10:57:17,231 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2019-09-07 10:57:17,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:57:17,242 INFO L256 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 29 conjunts are in the unsatisfiable core [2019-09-07 10:57:17,245 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:57:17,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6501 backedges. 2159 proven. 260 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2019-09-07 10:57:17,418 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:57:17,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 16] total 71 [2019-09-07 10:57:17,419 INFO L454 AbstractCegarLoop]: Interpolant automaton has 71 states [2019-09-07 10:57:17,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2019-09-07 10:57:17,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2394, Invalid=2576, Unknown=0, NotChecked=0, Total=4970 [2019-09-07 10:57:17,422 INFO L87 Difference]: Start difference. First operand 219 states and 275 transitions. Second operand 71 states. [2019-09-07 10:57:20,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:57:20,072 INFO L93 Difference]: Finished difference Result 869 states and 1107 transitions. [2019-09-07 10:57:20,072 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2019-09-07 10:57:20,072 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 211 [2019-09-07 10:57:20,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:57:20,075 INFO L225 Difference]: With dead ends: 869 [2019-09-07 10:57:20,075 INFO L226 Difference]: Without dead ends: 661 [2019-09-07 10:57:20,077 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1512 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2394, Invalid=2576, Unknown=0, NotChecked=0, Total=4970 [2019-09-07 10:57:20,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2019-09-07 10:57:20,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 225. [2019-09-07 10:57:20,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2019-09-07 10:57:20,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 281 transitions. [2019-09-07 10:57:20,096 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 281 transitions. Word has length 211 [2019-09-07 10:57:20,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:57:20,096 INFO L475 AbstractCegarLoop]: Abstraction has 225 states and 281 transitions. [2019-09-07 10:57:20,096 INFO L476 AbstractCegarLoop]: Interpolant automaton has 71 states. [2019-09-07 10:57:20,096 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 281 transitions. [2019-09-07 10:57:20,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 221 [2019-09-07 10:57:20,099 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:57:20,099 INFO L399 BasicCegarLoop]: trace histogram [69, 69, 54, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:57:20,099 INFO L418 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:57:20,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:57:20,100 INFO L82 PathProgramCache]: Analyzing trace with hash -382910204, now seen corresponding path program 16 times [2019-09-07 10:57:20,100 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:57:20,100 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:57:20,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:57:20,101 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:57:20,101 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:57:20,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:57:21,573 INFO L134 CoverageAnalysis]: Checked inductivity of 7107 backedges. 2405 proven. 4401 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2019-09-07 10:57:21,574 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:57:21,574 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:57:21,584 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-07 10:57:21,658 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-07 10:57:21,659 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 10:57:21,661 INFO L256 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 71 conjunts are in the unsatisfiable core [2019-09-07 10:57:21,664 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 10:57:22,352 INFO L134 CoverageAnalysis]: Checked inductivity of 7107 backedges. 137 proven. 6970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 10:57:22,355 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 10:57:22,356 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 72] total 72 [2019-09-07 10:57:22,356 INFO L454 AbstractCegarLoop]: Interpolant automaton has 72 states [2019-09-07 10:57:22,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2019-09-07 10:57:22,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2019-09-07 10:57:22,359 INFO L87 Difference]: Start difference. First operand 225 states and 281 transitions. Second operand 72 states. [2019-09-07 10:57:25,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 10:57:25,540 INFO L93 Difference]: Finished difference Result 724 states and 934 transitions. [2019-09-07 10:57:25,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2019-09-07 10:57:25,540 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 220 [2019-09-07 10:57:25,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 10:57:25,544 INFO L225 Difference]: With dead ends: 724 [2019-09-07 10:57:25,545 INFO L226 Difference]: Without dead ends: 713 [2019-09-07 10:57:25,547 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 207 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2556, Invalid=2556, Unknown=0, NotChecked=0, Total=5112 [2019-09-07 10:57:25,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 713 states. [2019-09-07 10:57:25,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 713 to 267. [2019-09-07 10:57:25,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2019-09-07 10:57:25,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 337 transitions. [2019-09-07 10:57:25,565 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 337 transitions. Word has length 220 [2019-09-07 10:57:25,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 10:57:25,566 INFO L475 AbstractCegarLoop]: Abstraction has 267 states and 337 transitions. [2019-09-07 10:57:25,566 INFO L476 AbstractCegarLoop]: Interpolant automaton has 72 states. [2019-09-07 10:57:25,566 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 337 transitions. [2019-09-07 10:57:25,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2019-09-07 10:57:25,569 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 10:57:25,569 INFO L399 BasicCegarLoop]: trace histogram [83, 83, 69, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 10:57:25,570 INFO L418 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 10:57:25,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 10:57:25,570 INFO L82 PathProgramCache]: Analyzing trace with hash -1872830682, now seen corresponding path program 17 times [2019-09-07 10:57:25,570 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 10:57:25,570 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 10:57:25,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:57:25,571 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 10:57:25,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 10:57:25,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 10:57:27,547 INFO L134 CoverageAnalysis]: Checked inductivity of 10292 backedges. 2856 proven. 7176 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-09-07 10:57:27,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 10:57:27,547 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 10:57:27,559 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2019-09-07 11:00:59,127 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 84 check-sat command(s) [2019-09-07 11:00:59,127 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 11:00:59,177 INFO L256 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 18 conjunts are in the unsatisfiable core [2019-09-07 11:00:59,180 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 11:00:59,341 INFO L134 CoverageAnalysis]: Checked inductivity of 10292 backedges. 3021 proven. 301 refuted. 0 times theorem prover too weak. 6970 trivial. 0 not checked. [2019-09-07 11:00:59,369 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 11:00:59,370 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 18] total 89 [2019-09-07 11:00:59,370 INFO L454 AbstractCegarLoop]: Interpolant automaton has 89 states [2019-09-07 11:00:59,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2019-09-07 11:00:59,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3888, Invalid=3944, Unknown=0, NotChecked=0, Total=7832 [2019-09-07 11:00:59,373 INFO L87 Difference]: Start difference. First operand 267 states and 337 transitions. Second operand 89 states. [2019-09-07 11:01:03,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 11:01:03,287 INFO L93 Difference]: Finished difference Result 1084 states and 1396 transitions. [2019-09-07 11:01:03,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2019-09-07 11:01:03,287 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 262 [2019-09-07 11:01:03,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 11:01:03,291 INFO L225 Difference]: With dead ends: 1084 [2019-09-07 11:01:03,291 INFO L226 Difference]: Without dead ends: 864 [2019-09-07 11:01:03,295 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3422 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=5209, Invalid=5503, Unknown=0, NotChecked=0, Total=10712 [2019-09-07 11:01:03,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 864 states. [2019-09-07 11:01:03,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 864 to 279. [2019-09-07 11:01:03,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2019-09-07 11:01:03,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 352 transitions. [2019-09-07 11:01:03,319 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 352 transitions. Word has length 262 [2019-09-07 11:01:03,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 11:01:03,319 INFO L475 AbstractCegarLoop]: Abstraction has 279 states and 352 transitions. [2019-09-07 11:01:03,319 INFO L476 AbstractCegarLoop]: Interpolant automaton has 89 states. [2019-09-07 11:01:03,319 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 352 transitions. [2019-09-07 11:01:03,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2019-09-07 11:01:03,323 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 11:01:03,323 INFO L399 BasicCegarLoop]: trace histogram [86, 86, 70, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 11:01:03,323 INFO L418 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 11:01:03,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 11:01:03,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1673374295, now seen corresponding path program 18 times [2019-09-07 11:01:03,324 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 11:01:03,324 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 11:01:03,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 11:01:03,325 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 11:01:03,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 11:01:03,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 11:01:05,281 INFO L134 CoverageAnalysis]: Checked inductivity of 11051 backedges. 3321 proven. 7385 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2019-09-07 11:01:05,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 11:01:05,281 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 11:01:05,293 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2019-09-07 11:09:37,448 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 85 check-sat command(s) [2019-09-07 11:09:37,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 11:09:37,583 INFO L256 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 44 conjunts are in the unsatisfiable core [2019-09-07 11:09:37,586 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 11:09:37,994 INFO L134 CoverageAnalysis]: Checked inductivity of 11051 backedges. 4959 proven. 1190 refuted. 0 times theorem prover too weak. 4902 trivial. 0 not checked. [2019-09-07 11:09:38,034 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 11:09:38,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 32] total 104 [2019-09-07 11:09:38,035 INFO L454 AbstractCegarLoop]: Interpolant automaton has 104 states [2019-09-07 11:09:38,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2019-09-07 11:09:38,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5042, Invalid=5670, Unknown=0, NotChecked=0, Total=10712 [2019-09-07 11:09:38,038 INFO L87 Difference]: Start difference. First operand 279 states and 352 transitions. Second operand 104 states. [2019-09-07 11:09:45,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 11:09:45,348 INFO L93 Difference]: Finished difference Result 1246 states and 1593 transitions. [2019-09-07 11:09:45,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2019-09-07 11:09:45,349 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 271 [2019-09-07 11:09:45,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 11:09:45,353 INFO L225 Difference]: With dead ends: 1246 [2019-09-07 11:09:45,354 INFO L226 Difference]: Without dead ends: 978 [2019-09-07 11:09:45,356 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 270 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8226 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=8774, Invalid=12106, Unknown=0, NotChecked=0, Total=20880 [2019-09-07 11:09:45,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 978 states. [2019-09-07 11:09:45,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 978 to 324. [2019-09-07 11:09:45,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 324 states. [2019-09-07 11:09:45,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 398 transitions. [2019-09-07 11:09:45,382 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 398 transitions. Word has length 271 [2019-09-07 11:09:45,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 11:09:45,382 INFO L475 AbstractCegarLoop]: Abstraction has 324 states and 398 transitions. [2019-09-07 11:09:45,382 INFO L476 AbstractCegarLoop]: Interpolant automaton has 104 states. [2019-09-07 11:09:45,382 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 398 transitions. [2019-09-07 11:09:45,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2019-09-07 11:09:45,386 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 11:09:45,387 INFO L399 BasicCegarLoop]: trace histogram [101, 101, 71, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 11:09:45,387 INFO L418 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 11:09:45,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 11:09:45,387 INFO L82 PathProgramCache]: Analyzing trace with hash 1098558086, now seen corresponding path program 19 times [2019-09-07 11:09:45,387 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 11:09:45,387 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 11:09:45,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 11:09:45,388 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 11:09:45,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 11:09:45,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 11:09:47,998 INFO L134 CoverageAnalysis]: Checked inductivity of 15251 backedges. 6378 proven. 7597 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2019-09-07 11:09:47,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 11:09:47,999 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-07 11:09:48,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 11:09:48,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 11:09:48,103 INFO L256 TraceCheckSpWp]: Trace formula consists of 595 conjuncts, 103 conjunts are in the unsatisfiable core [2019-09-07 11:09:48,108 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 11:09:49,880 INFO L134 CoverageAnalysis]: Checked inductivity of 15251 backedges. 201 proven. 15050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (20)] Exception during sending of exit command (exit): Broken pipe [2019-09-07 11:09:49,888 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 11:09:49,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 104] total 104 [2019-09-07 11:09:49,889 INFO L454 AbstractCegarLoop]: Interpolant automaton has 104 states [2019-09-07 11:09:49,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2019-09-07 11:09:49,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2019-09-07 11:09:49,892 INFO L87 Difference]: Start difference. First operand 324 states and 398 transitions. Second operand 104 states. [2019-09-07 11:09:55,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 11:09:55,472 INFO L93 Difference]: Finished difference Result 1136 states and 1473 transitions. [2019-09-07 11:09:55,476 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2019-09-07 11:09:55,476 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 316 [2019-09-07 11:09:55,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 11:09:55,480 INFO L225 Difference]: With dead ends: 1136 [2019-09-07 11:09:55,480 INFO L226 Difference]: Without dead ends: 1125 [2019-09-07 11:09:55,482 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 288 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5356, Invalid=5356, Unknown=0, NotChecked=0, Total=10712 [2019-09-07 11:09:55,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1125 states. [2019-09-07 11:09:55,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1125 to 414. [2019-09-07 11:09:55,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2019-09-07 11:09:55,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 518 transitions. [2019-09-07 11:09:55,510 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 518 transitions. Word has length 316 [2019-09-07 11:09:55,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 11:09:55,511 INFO L475 AbstractCegarLoop]: Abstraction has 414 states and 518 transitions. [2019-09-07 11:09:55,511 INFO L476 AbstractCegarLoop]: Interpolant automaton has 104 states. [2019-09-07 11:09:55,511 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 518 transitions. [2019-09-07 11:09:55,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2019-09-07 11:09:55,517 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 11:09:55,518 INFO L399 BasicCegarLoop]: trace histogram [131, 131, 101, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 11:09:55,518 INFO L418 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 11:09:55,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 11:09:55,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1375388122, now seen corresponding path program 20 times [2019-09-07 11:09:55,518 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 11:09:55,519 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 11:09:55,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 11:09:55,519 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-07 11:09:55,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 11:09:55,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 11:09:59,444 INFO L134 CoverageAnalysis]: Checked inductivity of 25676 backedges. 9048 proven. 15352 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2019-09-07 11:09:59,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 11:09:59,444 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 11:09:59,455 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-07 11:09:59,578 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-07 11:09:59,579 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-07 11:09:59,584 INFO L256 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 133 conjunts are in the unsatisfiable core [2019-09-07 11:09:59,592 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-07 11:10:02,526 INFO L134 CoverageAnalysis]: Checked inductivity of 25676 backedges. 261 proven. 25415 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-07 11:10:02,530 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-07 11:10:02,530 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 134] total 134 [2019-09-07 11:10:02,531 INFO L454 AbstractCegarLoop]: Interpolant automaton has 134 states [2019-09-07 11:10:02,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2019-09-07 11:10:02,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2019-09-07 11:10:02,533 INFO L87 Difference]: Start difference. First operand 414 states and 518 transitions. Second operand 134 states. [2019-09-07 11:10:14,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-07 11:10:14,239 INFO L93 Difference]: Finished difference Result 1436 states and 1863 transitions. [2019-09-07 11:10:14,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2019-09-07 11:10:14,240 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 406 [2019-09-07 11:10:14,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-07 11:10:14,251 INFO L225 Difference]: With dead ends: 1436 [2019-09-07 11:10:14,252 INFO L226 Difference]: Without dead ends: 1425 [2019-09-07 11:10:14,253 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 378 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=8911, Invalid=8911, Unknown=0, NotChecked=0, Total=17822 [2019-09-07 11:10:14,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1425 states. [2019-09-07 11:10:14,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1425 to 504. [2019-09-07 11:10:14,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 504 states. [2019-09-07 11:10:14,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 638 transitions. [2019-09-07 11:10:14,297 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 638 transitions. Word has length 406 [2019-09-07 11:10:14,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-07 11:10:14,298 INFO L475 AbstractCegarLoop]: Abstraction has 504 states and 638 transitions. [2019-09-07 11:10:14,298 INFO L476 AbstractCegarLoop]: Interpolant automaton has 134 states. [2019-09-07 11:10:14,298 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 638 transitions. [2019-09-07 11:10:14,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 497 [2019-09-07 11:10:14,302 INFO L391 BasicCegarLoop]: Found error trace [2019-09-07 11:10:14,302 INFO L399 BasicCegarLoop]: trace histogram [161, 161, 131, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-07 11:10:14,303 INFO L418 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-07 11:10:14,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-07 11:10:14,303 INFO L82 PathProgramCache]: Analyzing trace with hash 422283718, now seen corresponding path program 21 times [2019-09-07 11:10:14,303 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-07 11:10:14,303 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-07 11:10:14,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 11:10:14,305 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-07 11:10:14,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-07 11:10:14,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-07 11:10:21,377 INFO L134 CoverageAnalysis]: Checked inductivity of 38801 backedges. 11718 proven. 25807 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2019-09-07 11:10:21,377 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-07 11:10:21,377 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-07 11:10:21,390 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2