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-examples/standard_copy1_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:42:44,634 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:42:44,637 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:42:44,655 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:42:44,655 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:42:44,657 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:42:44,659 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:42:44,672 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:42:44,674 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:42:44,676 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:42:44,678 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:42:44,680 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:42:44,681 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:42:44,684 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:42:44,685 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:42:44,687 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:42:44,689 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:42:44,691 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:42:44,693 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:42:44,698 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:42:44,700 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:42:44,701 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:42:44,704 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:42:44,704 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:42:44,707 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:42:44,712 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:42:44,714 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:42:44,715 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:42:44,716 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:42:44,717 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:42:44,718 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:42:44,718 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:42:44,718 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:42:44,719 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:42:44,721 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:42:44,722 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:42:44,723 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 [2019-10-14 21:42:44,743 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:42:44,743 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:42:44,745 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:42:44,746 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:42:44,746 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:42:44,746 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:42:44,746 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:42:44,746 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:42:44,747 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:42:44,747 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:42:44,748 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:42:44,748 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:42:44,748 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:42:44,749 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:42:44,749 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:42:44,749 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:42:44,749 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:42:44,750 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:42:44,750 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:42:44,750 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:42:44,750 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:42:44,750 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:42:44,751 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:42:44,751 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:42:44,751 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:42:44,751 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:42:44,751 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:42:44,752 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:42:44,752 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:42:45,023 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:42:45,035 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:42:45,039 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:42:45,040 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:42:45,041 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:42:45,041 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy1_ground-1.i [2019-10-14 21:42:45,112 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4acdcd486/365b627ef889492889a5ba6b205c1451/FLAG3c3abf7fe [2019-10-14 21:42:45,555 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:42:45,558 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy1_ground-1.i [2019-10-14 21:42:45,564 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4acdcd486/365b627ef889492889a5ba6b205c1451/FLAG3c3abf7fe [2019-10-14 21:42:45,964 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4acdcd486/365b627ef889492889a5ba6b205c1451 [2019-10-14 21:42:45,974 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:42:45,976 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:42:45,977 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:42:45,977 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:42:45,980 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:42:45,981 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:42:45" (1/1) ... [2019-10-14 21:42:45,984 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c04ebec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:45, skipping insertion in model container [2019-10-14 21:42:45,985 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:42:45" (1/1) ... [2019-10-14 21:42:45,992 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:42:46,009 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:42:46,171 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:42:46,175 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:42:46,204 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:42:46,227 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:42:46,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46 WrapperNode [2019-10-14 21:42:46,228 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:42:46,229 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:42:46,229 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:42:46,229 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:42:46,322 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46" (1/1) ... [2019-10-14 21:42:46,322 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46" (1/1) ... [2019-10-14 21:42:46,329 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46" (1/1) ... [2019-10-14 21:42:46,329 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46" (1/1) ... [2019-10-14 21:42:46,336 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46" (1/1) ... [2019-10-14 21:42:46,341 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46" (1/1) ... [2019-10-14 21:42:46,346 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46" (1/1) ... [2019-10-14 21:42:46,352 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:42:46,352 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:42:46,352 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:42:46,352 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:42:46,354 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46" (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 [2019-10-14 21:42:46,408 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:42:46,408 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:42:46,409 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:42:46,409 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:42:46,409 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:42:46,409 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:42:46,409 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:42:46,409 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:42:46,409 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:42:46,409 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:42:46,410 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:42:46,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:42:46,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:42:46,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:42:46,648 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:42:46,649 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-14 21:42:46,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:42:46 BoogieIcfgContainer [2019-10-14 21:42:46,650 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:42:46,652 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:42:46,652 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:42:46,655 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:42:46,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:42:45" (1/3) ... [2019-10-14 21:42:46,656 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1df07fc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:42:46, skipping insertion in model container [2019-10-14 21:42:46,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:42:46" (2/3) ... [2019-10-14 21:42:46,656 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1df07fc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:42:46, skipping insertion in model container [2019-10-14 21:42:46,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:42:46" (3/3) ... [2019-10-14 21:42:46,658 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy1_ground-1.i [2019-10-14 21:42:46,672 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:42:46,683 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:42:46,721 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:42:46,751 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:42:46,751 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:42:46,751 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:42:46,751 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:42:46,751 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:42:46,751 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:42:46,752 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:42:46,752 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:42:46,773 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-14 21:42:46,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:42:46,782 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:46,783 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:46,785 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:46,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:46,791 INFO L82 PathProgramCache]: Analyzing trace with hash 1778002988, now seen corresponding path program 1 times [2019-10-14 21:42:46,797 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:46,798 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739251567] [2019-10-14 21:42:46,798 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:46,798 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:46,798 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:46,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:46,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:46,963 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:42:46,964 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739251567] [2019-10-14 21:42:46,965 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:46,965 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:42:46,966 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740899545] [2019-10-14 21:42:46,970 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:42:46,971 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:46,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:42:46,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:42:46,988 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-10-14 21:42:47,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:47,105 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2019-10-14 21:42:47,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:42:47,108 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-10-14 21:42:47,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:47,120 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:42:47,120 INFO L226 Difference]: Without dead ends: 22 [2019-10-14 21:42:47,128 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:42:47,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-14 21:42:47,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-14 21:42:47,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 21:42:47,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-10-14 21:42:47,194 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2019-10-14 21:42:47,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:47,195 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-10-14 21:42:47,195 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:42:47,196 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-10-14 21:42:47,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:42:47,197 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:47,197 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:47,197 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:47,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:47,198 INFO L82 PathProgramCache]: Analyzing trace with hash -262172122, now seen corresponding path program 1 times [2019-10-14 21:42:47,198 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:47,199 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367182899] [2019-10-14 21:42:47,199 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:47,199 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:47,200 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:47,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:47,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:47,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:42:47,290 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367182899] [2019-10-14 21:42:47,290 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:47,291 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:42:47,291 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792696396] [2019-10-14 21:42:47,297 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:47,297 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:47,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:47,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:47,302 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2019-10-14 21:42:47,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:47,385 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2019-10-14 21:42:47,386 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:42:47,386 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-14 21:42:47,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:47,387 INFO L225 Difference]: With dead ends: 38 [2019-10-14 21:42:47,387 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 21:42:47,389 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:47,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 21:42:47,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-10-14 21:42:47,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-14 21:42:47,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-10-14 21:42:47,396 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2019-10-14 21:42:47,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:47,397 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-10-14 21:42:47,397 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:47,397 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-10-14 21:42:47,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:42:47,398 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:47,398 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:47,399 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:47,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:47,399 INFO L82 PathProgramCache]: Analyzing trace with hash 1578997828, now seen corresponding path program 1 times [2019-10-14 21:42:47,399 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:47,400 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742312708] [2019-10-14 21:42:47,400 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:47,400 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:47,400 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:47,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:47,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:47,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:47,494 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742312708] [2019-10-14 21:42:47,494 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:42:47,494 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:42:47,495 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950360411] [2019-10-14 21:42:47,495 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:42:47,496 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:47,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:42:47,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:47,497 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 4 states. [2019-10-14 21:42:47,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:47,554 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2019-10-14 21:42:47,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:42:47,555 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-14 21:42:47,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:47,556 INFO L225 Difference]: With dead ends: 36 [2019-10-14 21:42:47,556 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 21:42:47,556 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:42:47,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 21:42:47,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-10-14 21:42:47,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:42:47,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-14 21:42:47,562 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-10-14 21:42:47,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:47,563 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-14 21:42:47,563 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:42:47,563 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-14 21:42:47,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 21:42:47,564 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:47,564 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:47,565 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:47,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:47,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1323409058, now seen corresponding path program 1 times [2019-10-14 21:42:47,565 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:47,566 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371558555] [2019-10-14 21:42:47,566 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:47,566 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:47,566 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:47,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:47,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:47,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:47,666 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371558555] [2019-10-14 21:42:47,667 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901811673] [2019-10-14 21:42:47,667 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:47,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:47,731 INFO L256 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:42:47,737 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:47,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:47,780 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:47,780 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:42:47,780 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739247296] [2019-10-14 21:42:47,782 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:42:47,782 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:47,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:42:47,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:42:47,784 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 6 states. [2019-10-14 21:42:47,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:47,870 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2019-10-14 21:42:47,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:42:47,870 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2019-10-14 21:42:47,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:47,871 INFO L225 Difference]: With dead ends: 42 [2019-10-14 21:42:47,871 INFO L226 Difference]: Without dead ends: 27 [2019-10-14 21:42:47,872 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:42:47,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-14 21:42:47,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2019-10-14 21:42:47,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-14 21:42:47,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-10-14 21:42:47,878 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2019-10-14 21:42:47,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:47,879 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-10-14 21:42:47,879 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:42:47,879 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-10-14 21:42:47,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-14 21:42:47,880 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:47,880 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:48,083 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:48,086 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:48,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:48,087 INFO L82 PathProgramCache]: Analyzing trace with hash 64185792, now seen corresponding path program 2 times [2019-10-14 21:42:48,087 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:48,088 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465366099] [2019-10-14 21:42:48,088 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:48,088 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:48,089 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:48,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:48,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:48,185 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:48,186 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465366099] [2019-10-14 21:42:48,186 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993014760] [2019-10-14 21:42:48,186 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:48,231 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:48,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:48,232 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:42:48,234 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:48,253 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:48,254 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:48,254 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:42:48,254 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080499044] [2019-10-14 21:42:48,255 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:42:48,255 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:48,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:42:48,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:42:48,256 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 7 states. [2019-10-14 21:42:48,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:48,338 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2019-10-14 21:42:48,339 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:42:48,339 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2019-10-14 21:42:48,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:48,340 INFO L225 Difference]: With dead ends: 44 [2019-10-14 21:42:48,340 INFO L226 Difference]: Without dead ends: 29 [2019-10-14 21:42:48,341 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:42:48,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-14 21:42:48,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-10-14 21:42:48,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:42:48,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-10-14 21:42:48,350 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2019-10-14 21:42:48,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:48,350 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-10-14 21:42:48,350 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:42:48,351 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-10-14 21:42:48,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:42:48,352 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:48,352 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:48,553 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:48,554 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:48,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:48,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1131404638, now seen corresponding path program 3 times [2019-10-14 21:42:48,555 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:48,555 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127159692] [2019-10-14 21:42:48,555 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:48,556 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:48,556 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:48,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:48,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:48,659 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:42:48,659 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127159692] [2019-10-14 21:42:48,659 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347127641] [2019-10-14 21:42:48,660 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:48,711 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 21:42:48,719 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:48,720 INFO L256 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:42:48,724 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:48,752 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:42:48,752 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:48,752 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2019-10-14 21:42:48,753 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104346944] [2019-10-14 21:42:48,754 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:42:48,754 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:48,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:42:48,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:48,755 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 9 states. [2019-10-14 21:42:48,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:48,859 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2019-10-14 21:42:48,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:42:48,860 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2019-10-14 21:42:48,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:48,861 INFO L225 Difference]: With dead ends: 49 [2019-10-14 21:42:48,861 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 21:42:48,861 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:48,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 21:42:48,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-10-14 21:42:48,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-14 21:42:48,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-10-14 21:42:48,867 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 23 [2019-10-14 21:42:48,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:48,868 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-10-14 21:42:48,868 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:42:48,868 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-10-14 21:42:48,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 21:42:48,869 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:48,869 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:49,076 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:49,077 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:49,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:49,077 INFO L82 PathProgramCache]: Analyzing trace with hash -806191654, now seen corresponding path program 4 times [2019-10-14 21:42:49,077 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:49,077 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348291115] [2019-10-14 21:42:49,078 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:49,078 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:49,078 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:49,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:49,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:49,181 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:42:49,181 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348291115] [2019-10-14 21:42:49,181 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1656525619] [2019-10-14 21:42:49,181 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:49,221 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:49,222 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:49,223 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:42:49,225 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:49,243 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:42:49,244 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:49,244 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:42:49,244 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404495728] [2019-10-14 21:42:49,245 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:42:49,245 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:49,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:42:49,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:49,246 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 9 states. [2019-10-14 21:42:49,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:49,333 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2019-10-14 21:42:49,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:42:49,334 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-10-14 21:42:49,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:49,335 INFO L225 Difference]: With dead ends: 52 [2019-10-14 21:42:49,335 INFO L226 Difference]: Without dead ends: 35 [2019-10-14 21:42:49,336 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:42:49,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-14 21:42:49,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-10-14 21:42:49,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:42:49,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2019-10-14 21:42:49,341 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 27 [2019-10-14 21:42:49,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:49,341 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2019-10-14 21:42:49,341 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:42:49,341 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2019-10-14 21:42:49,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 21:42:49,342 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:49,342 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:49,552 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:49,552 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:49,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:49,552 INFO L82 PathProgramCache]: Analyzing trace with hash -1775089928, now seen corresponding path program 5 times [2019-10-14 21:42:49,553 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:49,553 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142653664] [2019-10-14 21:42:49,553 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:49,553 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:49,553 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:49,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:49,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:49,676 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:42:49,676 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142653664] [2019-10-14 21:42:49,677 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100010626] [2019-10-14 21:42:49,677 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:49,747 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-14 21:42:49,747 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:49,748 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:42:49,750 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:49,792 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:42:49,792 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:49,792 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2019-10-14 21:42:49,793 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915093194] [2019-10-14 21:42:49,793 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:42:49,794 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:49,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:42:49,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:49,794 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 12 states. [2019-10-14 21:42:49,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:49,944 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2019-10-14 21:42:49,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:42:49,945 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2019-10-14 21:42:49,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:49,948 INFO L225 Difference]: With dead ends: 57 [2019-10-14 21:42:49,948 INFO L226 Difference]: Without dead ends: 40 [2019-10-14 21:42:49,949 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:49,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-10-14 21:42:49,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2019-10-14 21:42:49,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-14 21:42:49,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2019-10-14 21:42:49,958 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 29 [2019-10-14 21:42:49,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:49,958 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2019-10-14 21:42:49,959 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:42:49,959 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2019-10-14 21:42:49,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-10-14 21:42:49,960 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:49,960 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:50,165 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:50,165 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:50,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:50,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1969191540, now seen corresponding path program 6 times [2019-10-14 21:42:50,166 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:50,166 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [754617454] [2019-10-14 21:42:50,166 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:50,167 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:50,167 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:50,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:50,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:50,300 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-14 21:42:50,301 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [754617454] [2019-10-14 21:42:50,301 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355894561] [2019-10-14 21:42:50,301 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:50,375 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:42:50,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:50,377 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:42:50,379 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:50,427 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:42:50,427 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:50,427 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2019-10-14 21:42:50,428 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496513425] [2019-10-14 21:42:50,428 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:42:50,428 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:50,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:42:50,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:42:50,429 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 14 states. [2019-10-14 21:42:50,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:50,550 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2019-10-14 21:42:50,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:42:50,550 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2019-10-14 21:42:50,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:50,551 INFO L225 Difference]: With dead ends: 63 [2019-10-14 21:42:50,551 INFO L226 Difference]: Without dead ends: 44 [2019-10-14 21:42:50,552 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:42:50,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-14 21:42:50,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2019-10-14 21:42:50,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-14 21:42:50,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2019-10-14 21:42:50,564 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 33 [2019-10-14 21:42:50,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:50,564 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2019-10-14 21:42:50,564 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:42:50,564 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2019-10-14 21:42:50,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-14 21:42:50,565 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:50,565 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:50,766 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:50,767 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:50,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:50,767 INFO L82 PathProgramCache]: Analyzing trace with hash -811630608, now seen corresponding path program 7 times [2019-10-14 21:42:50,768 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:50,768 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061281014] [2019-10-14 21:42:50,768 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:50,768 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:50,769 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:50,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:50,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:50,872 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:42:50,872 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061281014] [2019-10-14 21:42:50,873 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770493141] [2019-10-14 21:42:50,873 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:50,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:50,929 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:42:50,945 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:50,967 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:42:50,967 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:50,967 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:42:50,967 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41621381] [2019-10-14 21:42:50,968 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:42:50,968 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:50,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:42:50,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:50,969 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 12 states. [2019-10-14 21:42:51,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:51,088 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2019-10-14 21:42:51,088 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:42:51,088 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2019-10-14 21:42:51,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:51,089 INFO L225 Difference]: With dead ends: 66 [2019-10-14 21:42:51,089 INFO L226 Difference]: Without dead ends: 45 [2019-10-14 21:42:51,090 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:42:51,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-14 21:42:51,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2019-10-14 21:42:51,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-14 21:42:51,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-10-14 21:42:51,105 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2019-10-14 21:42:51,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:51,105 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-10-14 21:42:51,107 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:42:51,108 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-10-14 21:42:51,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-14 21:42:51,109 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:51,109 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:51,316 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:51,316 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:51,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:51,317 INFO L82 PathProgramCache]: Analyzing trace with hash 373619598, now seen corresponding path program 8 times [2019-10-14 21:42:51,317 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:51,318 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39471227] [2019-10-14 21:42:51,318 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:51,318 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:51,319 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:51,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:51,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:51,418 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:42:51,419 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39471227] [2019-10-14 21:42:51,419 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1240373820] [2019-10-14 21:42:51,419 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:51,471 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:51,471 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:51,472 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:42:51,474 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:51,508 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:42:51,509 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:51,509 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:42:51,509 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010366688] [2019-10-14 21:42:51,510 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:42:51,510 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:51,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:42:51,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:42:51,512 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 13 states. [2019-10-14 21:42:51,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:51,610 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2019-10-14 21:42:51,611 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:42:51,611 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 39 [2019-10-14 21:42:51,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:51,612 INFO L225 Difference]: With dead ends: 68 [2019-10-14 21:42:51,612 INFO L226 Difference]: Without dead ends: 47 [2019-10-14 21:42:51,613 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:42:51,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-10-14 21:42:51,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-10-14 21:42:51,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 21:42:51,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2019-10-14 21:42:51,618 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 39 [2019-10-14 21:42:51,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:51,619 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2019-10-14 21:42:51,619 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:42:51,619 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2019-10-14 21:42:51,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-14 21:42:51,620 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:51,620 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:51,823 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:51,824 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:51,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:51,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1232734124, now seen corresponding path program 9 times [2019-10-14 21:42:51,825 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:51,826 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540202421] [2019-10-14 21:42:51,826 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:51,826 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:51,826 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:51,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:51,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:51,966 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:42:51,966 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540202421] [2019-10-14 21:42:51,967 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100188641] [2019-10-14 21:42:51,967 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:52,017 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-14 21:42:52,017 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:52,018 INFO L256 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:42:52,019 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:52,080 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:42:52,081 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:52,081 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7] total 18 [2019-10-14 21:42:52,081 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880613929] [2019-10-14 21:42:52,082 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:42:52,082 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:52,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:42:52,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:42:52,083 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 18 states. [2019-10-14 21:42:52,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:52,184 INFO L93 Difference]: Finished difference Result 73 states and 78 transitions. [2019-10-14 21:42:52,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:42:52,184 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2019-10-14 21:42:52,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:52,186 INFO L225 Difference]: With dead ends: 73 [2019-10-14 21:42:52,186 INFO L226 Difference]: Without dead ends: 52 [2019-10-14 21:42:52,187 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:42:52,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-10-14 21:42:52,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2019-10-14 21:42:52,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-14 21:42:52,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2019-10-14 21:42:52,193 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 41 [2019-10-14 21:42:52,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:52,194 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2019-10-14 21:42:52,194 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:42:52,194 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2019-10-14 21:42:52,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-14 21:42:52,195 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:52,195 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:52,398 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:52,399 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:52,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:52,399 INFO L82 PathProgramCache]: Analyzing trace with hash 274047272, now seen corresponding path program 10 times [2019-10-14 21:42:52,400 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:52,400 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056572168] [2019-10-14 21:42:52,400 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:52,401 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:52,401 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:52,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:52,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:52,533 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:42:52,533 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056572168] [2019-10-14 21:42:52,533 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959850347] [2019-10-14 21:42:52,534 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:52,594 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:52,594 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:52,596 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:42:52,599 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:52,655 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-14 21:42:52,655 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:52,655 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:42:52,656 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627547151] [2019-10-14 21:42:52,656 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:42:52,656 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:52,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:42:52,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:42:52,658 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 15 states. [2019-10-14 21:42:52,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:52,757 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2019-10-14 21:42:52,758 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:42:52,758 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 45 [2019-10-14 21:42:52,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:52,759 INFO L225 Difference]: With dead ends: 76 [2019-10-14 21:42:52,759 INFO L226 Difference]: Without dead ends: 53 [2019-10-14 21:42:52,760 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:42:52,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-10-14 21:42:52,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2019-10-14 21:42:52,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:42:52,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-10-14 21:42:52,778 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 45 [2019-10-14 21:42:52,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:52,779 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-10-14 21:42:52,779 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:42:52,779 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-10-14 21:42:52,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:42:52,780 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:52,781 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:52,990 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:52,990 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:52,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:52,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1166843590, now seen corresponding path program 11 times [2019-10-14 21:42:52,991 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:52,991 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381116344] [2019-10-14 21:42:52,991 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:52,991 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:52,992 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:53,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:53,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:53,101 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 21:42:53,101 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381116344] [2019-10-14 21:42:53,102 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31235896] [2019-10-14 21:42:53,102 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:53,516 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-14 21:42:53,516 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:53,518 INFO L256 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:42:53,520 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:53,533 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 21:42:53,533 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:53,534 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:42:53,534 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255412945] [2019-10-14 21:42:53,534 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:42:53,534 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:53,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:42:53,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:42:53,535 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 10 states. [2019-10-14 21:42:53,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:53,607 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2019-10-14 21:42:53,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:42:53,607 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 47 [2019-10-14 21:42:53,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:53,608 INFO L225 Difference]: With dead ends: 66 [2019-10-14 21:42:53,608 INFO L226 Difference]: Without dead ends: 55 [2019-10-14 21:42:53,609 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:42:53,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-14 21:42:53,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2019-10-14 21:42:53,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-10-14 21:42:53,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2019-10-14 21:42:53,614 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 47 [2019-10-14 21:42:53,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:53,615 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2019-10-14 21:42:53,615 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:42:53,615 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2019-10-14 21:42:53,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-10-14 21:42:53,616 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:53,616 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:53,817 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:53,817 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:53,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:53,818 INFO L82 PathProgramCache]: Analyzing trace with hash 380177572, now seen corresponding path program 12 times [2019-10-14 21:42:53,818 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:53,818 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250977399] [2019-10-14 21:42:53,818 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:53,819 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:53,819 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:53,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:53,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:53,919 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 21:42:53,919 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250977399] [2019-10-14 21:42:53,919 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505698576] [2019-10-14 21:42:53,919 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:54,304 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2019-10-14 21:42:54,305 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:54,306 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:42:54,308 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:54,333 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 21:42:54,333 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:54,334 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:42:54,334 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592294702] [2019-10-14 21:42:54,334 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:42:54,335 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:54,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:42:54,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:42:54,337 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 11 states. [2019-10-14 21:42:54,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:54,423 INFO L93 Difference]: Finished difference Result 68 states and 71 transitions. [2019-10-14 21:42:54,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:42:54,424 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2019-10-14 21:42:54,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:54,425 INFO L225 Difference]: With dead ends: 68 [2019-10-14 21:42:54,425 INFO L226 Difference]: Without dead ends: 57 [2019-10-14 21:42:54,426 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:42:54,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-10-14 21:42:54,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2019-10-14 21:42:54,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-14 21:42:54,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-10-14 21:42:54,435 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2019-10-14 21:42:54,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:54,436 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-10-14 21:42:54,436 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:42:54,436 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-10-14 21:42:54,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 21:42:54,437 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:54,437 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:54,644 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:54,644 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:54,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:54,644 INFO L82 PathProgramCache]: Analyzing trace with hash 308378370, now seen corresponding path program 13 times [2019-10-14 21:42:54,645 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:54,645 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637792568] [2019-10-14 21:42:54,645 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:54,645 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:54,645 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:54,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:54,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:54,738 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 21:42:54,738 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637792568] [2019-10-14 21:42:54,738 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2030568466] [2019-10-14 21:42:54,739 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:54,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:54,792 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:42:54,794 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:54,970 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 21:42:54,970 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:54,971 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 23 [2019-10-14 21:42:54,971 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12991088] [2019-10-14 21:42:54,971 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:42:54,972 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:54,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:42:54,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=369, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:42:54,973 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 23 states. [2019-10-14 21:42:55,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:55,170 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2019-10-14 21:42:55,170 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-14 21:42:55,170 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2019-10-14 21:42:55,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:55,171 INFO L225 Difference]: With dead ends: 89 [2019-10-14 21:42:55,171 INFO L226 Difference]: Without dead ends: 62 [2019-10-14 21:42:55,172 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=137, Invalid=369, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:42:55,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-14 21:42:55,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2019-10-14 21:42:55,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-14 21:42:55,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-10-14 21:42:55,177 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 51 [2019-10-14 21:42:55,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:55,177 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-10-14 21:42:55,177 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:42:55,177 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-10-14 21:42:55,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-14 21:42:55,178 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:55,178 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:55,389 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:55,389 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:55,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:55,390 INFO L82 PathProgramCache]: Analyzing trace with hash -992065154, now seen corresponding path program 14 times [2019-10-14 21:42:55,390 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:55,390 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307669720] [2019-10-14 21:42:55,391 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:55,391 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:55,391 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:55,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:55,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:55,496 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-14 21:42:55,497 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307669720] [2019-10-14 21:42:55,497 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019895313] [2019-10-14 21:42:55,497 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:55,553 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:42:55,554 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:55,555 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:42:55,556 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:55,755 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-14 21:42:55,755 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:55,756 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15] total 25 [2019-10-14 21:42:55,756 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764714564] [2019-10-14 21:42:55,756 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 21:42:55,756 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:55,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 21:42:55,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=439, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:42:55,757 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 25 states. [2019-10-14 21:42:55,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:55,924 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2019-10-14 21:42:55,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 21:42:55,924 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2019-10-14 21:42:55,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:55,925 INFO L225 Difference]: With dead ends: 95 [2019-10-14 21:42:55,925 INFO L226 Difference]: Without dead ends: 66 [2019-10-14 21:42:55,926 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=439, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:42:55,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-14 21:42:55,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2019-10-14 21:42:55,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 21:42:55,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-10-14 21:42:55,932 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 55 [2019-10-14 21:42:55,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:55,932 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-10-14 21:42:55,932 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 21:42:55,932 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-10-14 21:42:55,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-14 21:42:55,933 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:55,933 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:56,134 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:56,134 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:56,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:56,134 INFO L82 PathProgramCache]: Analyzing trace with hash -826512902, now seen corresponding path program 15 times [2019-10-14 21:42:56,135 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:56,135 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366056392] [2019-10-14 21:42:56,135 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:56,135 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:56,135 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:56,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:56,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:56,296 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-14 21:42:56,297 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366056392] [2019-10-14 21:42:56,297 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140794093] [2019-10-14 21:42:56,297 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:56,641 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-14 21:42:56,641 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:56,644 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:42:56,645 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:56,793 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-14 21:42:56,793 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:56,793 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 12] total 27 [2019-10-14 21:42:56,794 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663638724] [2019-10-14 21:42:56,794 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-14 21:42:56,794 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:56,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-14 21:42:56,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:42:56,795 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 27 states. [2019-10-14 21:42:56,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:56,957 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2019-10-14 21:42:56,957 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-14 21:42:56,957 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 59 [2019-10-14 21:42:56,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:56,958 INFO L225 Difference]: With dead ends: 101 [2019-10-14 21:42:56,958 INFO L226 Difference]: Without dead ends: 70 [2019-10-14 21:42:56,959 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2019-10-14 21:42:56,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-10-14 21:42:56,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2019-10-14 21:42:56,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-10-14 21:42:56,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2019-10-14 21:42:56,964 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 59 [2019-10-14 21:42:56,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:56,964 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2019-10-14 21:42:56,964 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-14 21:42:56,964 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2019-10-14 21:42:56,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 21:42:56,965 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:56,965 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:57,175 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:57,176 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:57,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:57,177 INFO L82 PathProgramCache]: Analyzing trace with hash -981017482, now seen corresponding path program 16 times [2019-10-14 21:42:57,177 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:57,177 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270106199] [2019-10-14 21:42:57,177 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:57,177 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:57,178 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:57,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:57,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:57,348 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:42:57,349 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270106199] [2019-10-14 21:42:57,349 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803217734] [2019-10-14 21:42:57,349 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:57,405 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:42:57,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:42:57,406 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:42:57,407 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:42:57,426 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:42:57,427 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:42:57,427 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:42:57,427 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429987109] [2019-10-14 21:42:57,427 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:42:57,428 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:42:57,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:42:57,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:42:57,428 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 19 states. [2019-10-14 21:42:57,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:42:57,545 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2019-10-14 21:42:57,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:42:57,546 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 63 [2019-10-14 21:42:57,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:42:57,547 INFO L225 Difference]: With dead ends: 104 [2019-10-14 21:42:57,547 INFO L226 Difference]: Without dead ends: 71 [2019-10-14 21:42:57,548 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:42:57,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-10-14 21:42:57,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2019-10-14 21:42:57,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-10-14 21:42:57,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2019-10-14 21:42:57,552 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 63 [2019-10-14 21:42:57,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:42:57,553 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2019-10-14 21:42:57,553 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:42:57,553 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2019-10-14 21:42:57,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-14 21:42:57,554 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:42:57,554 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:42:57,758 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:42:57,758 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:42:57,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:42:57,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1426002284, now seen corresponding path program 17 times [2019-10-14 21:42:57,759 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:42:57,759 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808533537] [2019-10-14 21:42:57,759 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:57,760 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:42:57,760 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:42:57,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:57,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:42:57,948 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:42:57,949 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808533537] [2019-10-14 21:42:57,949 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326327846] [2019-10-14 21:42:57,949 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:01,605 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2019-10-14 21:43:01,605 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:01,611 INFO L256 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 21:43:01,613 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:01,631 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:43:01,632 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:01,632 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:43:01,632 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133338496] [2019-10-14 21:43:01,633 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:43:01,633 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:01,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:43:01,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:43:01,634 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 20 states. [2019-10-14 21:43:01,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:01,754 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2019-10-14 21:43:01,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:43:01,755 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 65 [2019-10-14 21:43:01,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:01,755 INFO L225 Difference]: With dead ends: 106 [2019-10-14 21:43:01,755 INFO L226 Difference]: Without dead ends: 73 [2019-10-14 21:43:01,756 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:43:01,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-10-14 21:43:01,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2019-10-14 21:43:01,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-10-14 21:43:01,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2019-10-14 21:43:01,760 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 65 [2019-10-14 21:43:01,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:01,761 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2019-10-14 21:43:01,761 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:43:01,761 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2019-10-14 21:43:01,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-14 21:43:01,762 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:01,762 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:01,968 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:01,969 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:01,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:01,969 INFO L82 PathProgramCache]: Analyzing trace with hash 440332594, now seen corresponding path program 18 times [2019-10-14 21:43:01,970 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:01,970 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516046629] [2019-10-14 21:43:01,970 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:01,970 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:01,971 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:01,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:02,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:02,189 INFO L134 CoverageAnalysis]: Checked inductivity of 356 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:43:02,189 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516046629] [2019-10-14 21:43:02,189 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886481886] [2019-10-14 21:43:02,189 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:04,839 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 17 check-sat command(s) [2019-10-14 21:43:04,840 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:04,845 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:43:04,846 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:04,909 INFO L134 CoverageAnalysis]: Checked inductivity of 356 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:43:04,910 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:04,910 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:43:04,911 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786897626] [2019-10-14 21:43:04,912 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:43:04,912 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:04,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:43:04,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:43:04,913 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 21 states. [2019-10-14 21:43:05,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:05,050 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2019-10-14 21:43:05,050 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:43:05,050 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 67 [2019-10-14 21:43:05,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:05,051 INFO L225 Difference]: With dead ends: 108 [2019-10-14 21:43:05,051 INFO L226 Difference]: Without dead ends: 75 [2019-10-14 21:43:05,052 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:43:05,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-10-14 21:43:05,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2019-10-14 21:43:05,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-10-14 21:43:05,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2019-10-14 21:43:05,056 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 67 [2019-10-14 21:43:05,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:05,056 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2019-10-14 21:43:05,056 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:43:05,056 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2019-10-14 21:43:05,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-14 21:43:05,057 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:05,057 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:05,263 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:05,263 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:05,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:05,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1308179376, now seen corresponding path program 19 times [2019-10-14 21:43:05,264 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:05,265 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420367211] [2019-10-14 21:43:05,265 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:05,265 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:05,266 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:05,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:05,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:05,527 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:43:05,528 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420367211] [2019-10-14 21:43:05,528 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061135375] [2019-10-14 21:43:05,528 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:05,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:05,614 INFO L256 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:43:05,617 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:05,647 INFO L134 CoverageAnalysis]: Checked inductivity of 389 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:43:05,648 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:05,648 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-14 21:43:05,648 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411568203] [2019-10-14 21:43:05,648 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:43:05,649 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:05,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:43:05,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:43:05,649 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 22 states. [2019-10-14 21:43:05,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:05,809 INFO L93 Difference]: Finished difference Result 110 states and 114 transitions. [2019-10-14 21:43:05,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:43:05,811 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 69 [2019-10-14 21:43:05,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:05,811 INFO L225 Difference]: With dead ends: 110 [2019-10-14 21:43:05,812 INFO L226 Difference]: Without dead ends: 77 [2019-10-14 21:43:05,812 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:43:05,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-10-14 21:43:05,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-10-14 21:43:05,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-14 21:43:05,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2019-10-14 21:43:05,819 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 69 [2019-10-14 21:43:05,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:05,819 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2019-10-14 21:43:05,819 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:43:05,819 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2019-10-14 21:43:05,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-10-14 21:43:05,820 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:05,820 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:06,029 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:06,030 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:06,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:06,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1998997486, now seen corresponding path program 20 times [2019-10-14 21:43:06,030 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:06,031 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419904410] [2019-10-14 21:43:06,031 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:06,031 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:06,031 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:06,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:06,303 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:43:06,303 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419904410] [2019-10-14 21:43:06,303 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896780900] [2019-10-14 21:43:06,303 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:06,371 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:43:06,371 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:06,373 INFO L256 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 21:43:06,374 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:06,401 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:43:06,402 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:06,402 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-10-14 21:43:06,402 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034729613] [2019-10-14 21:43:06,405 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:43:06,406 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:06,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:43:06,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:43:06,407 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 23 states. [2019-10-14 21:43:06,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:06,568 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2019-10-14 21:43:06,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-14 21:43:06,568 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 71 [2019-10-14 21:43:06,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:06,569 INFO L225 Difference]: With dead ends: 112 [2019-10-14 21:43:06,569 INFO L226 Difference]: Without dead ends: 79 [2019-10-14 21:43:06,570 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:43:06,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-14 21:43:06,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2019-10-14 21:43:06,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-10-14 21:43:06,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2019-10-14 21:43:06,576 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 71 [2019-10-14 21:43:06,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:06,576 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2019-10-14 21:43:06,576 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:43:06,577 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2019-10-14 21:43:06,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-10-14 21:43:06,577 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:06,577 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:06,778 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:06,778 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:06,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:06,779 INFO L82 PathProgramCache]: Analyzing trace with hash 1920162828, now seen corresponding path program 21 times [2019-10-14 21:43:06,779 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:06,779 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796765799] [2019-10-14 21:43:06,780 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:06,780 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:06,780 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:06,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:07,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:07,032 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-14 21:43:07,033 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796765799] [2019-10-14 21:43:07,033 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764625527] [2019-10-14 21:43:07,033 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:07,572 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2019-10-14 21:43:07,572 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:07,575 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:43:07,576 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:07,789 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2019-10-14 21:43:07,791 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:07,791 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 13] total 34 [2019-10-14 21:43:07,792 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854981399] [2019-10-14 21:43:07,794 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-14 21:43:07,794 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:07,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-14 21:43:07,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=812, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:43:07,795 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 34 states. [2019-10-14 21:43:08,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:08,040 INFO L93 Difference]: Finished difference Result 117 states and 122 transitions. [2019-10-14 21:43:08,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-14 21:43:08,041 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 73 [2019-10-14 21:43:08,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:08,042 INFO L225 Difference]: With dead ends: 117 [2019-10-14 21:43:08,042 INFO L226 Difference]: Without dead ends: 84 [2019-10-14 21:43:08,042 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=310, Invalid=812, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:43:08,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-10-14 21:43:08,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2019-10-14 21:43:08,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-14 21:43:08,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2019-10-14 21:43:08,045 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 73 [2019-10-14 21:43:08,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:08,045 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2019-10-14 21:43:08,045 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-14 21:43:08,045 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2019-10-14 21:43:08,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-14 21:43:08,046 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:08,046 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:08,250 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:08,251 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:08,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:08,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1293903240, now seen corresponding path program 22 times [2019-10-14 21:43:08,251 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:08,251 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855969847] [2019-10-14 21:43:08,252 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:08,252 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:08,252 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:08,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:08,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:08,536 INFO L134 CoverageAnalysis]: Checked inductivity of 521 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-14 21:43:08,537 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855969847] [2019-10-14 21:43:08,537 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692799373] [2019-10-14 21:43:08,537 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:08,611 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:43:08,612 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:08,612 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:43:08,614 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:08,837 INFO L134 CoverageAnalysis]: Checked inductivity of 521 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-10-14 21:43:08,838 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:08,838 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 14] total 36 [2019-10-14 21:43:08,838 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590631861] [2019-10-14 21:43:08,838 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-14 21:43:08,839 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:08,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-14 21:43:08,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=915, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:43:08,839 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 36 states. [2019-10-14 21:43:09,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:09,168 INFO L93 Difference]: Finished difference Result 123 states and 128 transitions. [2019-10-14 21:43:09,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-14 21:43:09,168 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 77 [2019-10-14 21:43:09,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:09,169 INFO L225 Difference]: With dead ends: 123 [2019-10-14 21:43:09,169 INFO L226 Difference]: Without dead ends: 88 [2019-10-14 21:43:09,170 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=345, Invalid=915, Unknown=0, NotChecked=0, Total=1260 [2019-10-14 21:43:09,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-10-14 21:43:09,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 86. [2019-10-14 21:43:09,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2019-10-14 21:43:09,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2019-10-14 21:43:09,174 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 77 [2019-10-14 21:43:09,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:09,174 INFO L462 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2019-10-14 21:43:09,174 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-14 21:43:09,175 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2019-10-14 21:43:09,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-10-14 21:43:09,175 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:09,175 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:09,378 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:09,379 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:09,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:09,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1683799804, now seen corresponding path program 23 times [2019-10-14 21:43:09,380 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:09,380 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275354206] [2019-10-14 21:43:09,381 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:09,381 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:09,381 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:09,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:09,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:09,664 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-14 21:43:09,665 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275354206] [2019-10-14 21:43:09,665 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697324621] [2019-10-14 21:43:09,665 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:21,245 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 22 check-sat command(s) [2019-10-14 21:43:21,245 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:21,257 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:43:21,258 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:21,518 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-10-14 21:43:21,518 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:21,519 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 15] total 38 [2019-10-14 21:43:21,519 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114133315] [2019-10-14 21:43:21,519 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-10-14 21:43:21,520 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:21,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-10-14 21:43:21,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=1024, Unknown=0, NotChecked=0, Total=1406 [2019-10-14 21:43:21,521 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 38 states. [2019-10-14 21:43:21,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:21,801 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2019-10-14 21:43:21,801 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-14 21:43:21,802 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 81 [2019-10-14 21:43:21,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:21,802 INFO L225 Difference]: With dead ends: 129 [2019-10-14 21:43:21,814 INFO L226 Difference]: Without dead ends: 92 [2019-10-14 21:43:21,815 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=382, Invalid=1024, Unknown=0, NotChecked=0, Total=1406 [2019-10-14 21:43:21,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2019-10-14 21:43:21,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 90. [2019-10-14 21:43:21,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2019-10-14 21:43:21,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2019-10-14 21:43:21,820 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 81 [2019-10-14 21:43:21,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:21,820 INFO L462 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2019-10-14 21:43:21,820 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-10-14 21:43:21,820 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2019-10-14 21:43:21,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2019-10-14 21:43:21,821 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:21,821 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:22,031 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:22,031 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:22,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:22,032 INFO L82 PathProgramCache]: Analyzing trace with hash -515248512, now seen corresponding path program 24 times [2019-10-14 21:43:22,032 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:22,032 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800022969] [2019-10-14 21:43:22,033 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:22,033 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:22,033 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:22,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:22,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:22,487 INFO L134 CoverageAnalysis]: Checked inductivity of 653 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-14 21:43:22,487 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800022969] [2019-10-14 21:43:22,487 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350331254] [2019-10-14 21:43:22,488 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true