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_copyInitSum2_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:45:13,440 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:45:13,443 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:45:13,460 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:45:13,460 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:45:13,462 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:45:13,464 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:45:13,472 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:45:13,476 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:45:13,479 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:45:13,481 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:45:13,482 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:45:13,482 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:45:13,484 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:45:13,486 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:45:13,488 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:45:13,489 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:45:13,490 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:45:13,491 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:45:13,495 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:45:13,499 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:45:13,501 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:45:13,503 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:45:13,504 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:45:13,506 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 17:45:13,506 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 17:45:13,506 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 17:45:13,508 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 17:45:13,509 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 17:45:13,510 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 17:45:13,510 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:45:13,511 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:45:13,511 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:45:13,512 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:45:13,513 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:45:13,514 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:45:13,514 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:45:13,514 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:45:13,515 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:45:13,515 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:45:13,516 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:45:13,517 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 [2019-10-13 17:45:13,543 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:45:13,543 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:45:13,544 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:45:13,544 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:45:13,544 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:45:13,545 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:45:13,545 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:45:13,545 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:45:13,545 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:45:13,545 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:45:13,546 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:45:13,547 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:45:13,547 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:45:13,548 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:45:13,548 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:45:13,548 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:45:13,548 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:45:13,548 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:45:13,549 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:45:13,549 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:45:13,549 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:45:13,549 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:45:13,549 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:45:13,550 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:45:13,550 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:45:13,550 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:45:13,550 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:45:13,551 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:45:13,552 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:45:13,810 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:45:13,830 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:45:13,833 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:45:13,835 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:45:13,835 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:45:13,836 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copyInitSum2_ground-2.i [2019-10-13 17:45:13,911 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/557f01b49/18002b40e44b4e6eb8efb02e97a24ab0/FLAGac648a66d [2019-10-13 17:45:14,407 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:45:14,408 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copyInitSum2_ground-2.i [2019-10-13 17:45:14,415 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/557f01b49/18002b40e44b4e6eb8efb02e97a24ab0/FLAGac648a66d [2019-10-13 17:45:14,901 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/557f01b49/18002b40e44b4e6eb8efb02e97a24ab0 [2019-10-13 17:45:14,911 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:45:14,913 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:45:14,914 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:45:14,914 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:45:14,918 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:45:14,919 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,922 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@43471ae3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:14, skipping insertion in model container [2019-10-13 17:45:14,922 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:45:14" (1/1) ... [2019-10-13 17:45:14,930 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:45:14,945 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:45:15,156 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:45:15,160 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:45:15,180 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:45:15,198 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:45:15,198 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15 WrapperNode [2019-10-13 17:45:15,199 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:45:15,199 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:45:15,199 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:45:15,199 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:45:15,302 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15" (1/1) ... [2019-10-13 17:45:15,303 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15" (1/1) ... [2019-10-13 17:45:15,309 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15" (1/1) ... [2019-10-13 17:45:15,310 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15" (1/1) ... [2019-10-13 17:45:15,317 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15" (1/1) ... [2019-10-13 17:45:15,322 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15" (1/1) ... [2019-10-13 17:45:15,324 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15" (1/1) ... [2019-10-13 17:45:15,326 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:45:15,327 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:45:15,327 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:45:15,327 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:45:15,328 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15" (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 [2019-10-13 17:45:15,385 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:45:15,385 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:45:15,385 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 17:45:15,385 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:45:15,385 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:45:15,385 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 17:45:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:45:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-13 17:45:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 17:45:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 17:45:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 17:45:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:45:15,387 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:45:15,632 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:45:15,633 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-13 17:45:15,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:45:15 BoogieIcfgContainer [2019-10-13 17:45:15,635 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:45:15,645 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:45:15,646 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:45:15,650 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:45:15,650 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:45:14" (1/3) ... [2019-10-13 17:45:15,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5836b52d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:45:15, skipping insertion in model container [2019-10-13 17:45:15,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:45:15" (2/3) ... [2019-10-13 17:45:15,652 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5836b52d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:45:15, skipping insertion in model container [2019-10-13 17:45:15,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:45:15" (3/3) ... [2019-10-13 17:45:15,654 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copyInitSum2_ground-2.i [2019-10-13 17:45:15,683 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:45:15,691 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:45:15,713 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:45:15,734 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:45:15,734 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:45:15,734 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:45:15,734 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:45:15,734 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:45:15,734 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:45:15,735 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:45:15,735 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:45:15,749 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2019-10-13 17:45:15,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-13 17:45:15,754 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:15,755 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:15,756 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:15,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:15,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1001985310, now seen corresponding path program 1 times [2019-10-13 17:45:15,768 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:15,768 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721196020] [2019-10-13 17:45:15,768 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:15,769 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:15,769 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:15,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:15,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:15,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:45:15,947 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721196020] [2019-10-13 17:45:15,948 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:45:15,949 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 17:45:15,950 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384126677] [2019-10-13 17:45:15,955 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 17:45:15,956 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:15,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 17:45:15,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:45:15,972 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2019-10-13 17:45:16,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:16,086 INFO L93 Difference]: Finished difference Result 51 states and 66 transitions. [2019-10-13 17:45:16,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 17:45:16,088 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-13 17:45:16,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:16,098 INFO L225 Difference]: With dead ends: 51 [2019-10-13 17:45:16,098 INFO L226 Difference]: Without dead ends: 24 [2019-10-13 17:45:16,104 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 [2019-10-13 17:45:16,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-13 17:45:16,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-10-13 17:45:16,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-13 17:45:16,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2019-10-13 17:45:16,148 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2019-10-13 17:45:16,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:16,149 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2019-10-13 17:45:16,149 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 17:45:16,149 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2019-10-13 17:45:16,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-13 17:45:16,150 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:16,151 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:16,151 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:16,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:16,152 INFO L82 PathProgramCache]: Analyzing trace with hash -400143846, now seen corresponding path program 1 times [2019-10-13 17:45:16,152 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:16,152 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507005908] [2019-10-13 17:45:16,153 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:16,153 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:16,153 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:16,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:45:16,229 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507005908] [2019-10-13 17:45:16,229 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:45:16,230 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:45:16,230 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895131689] [2019-10-13 17:45:16,232 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:45:16,232 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:16,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:45:16,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:45:16,233 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 4 states. [2019-10-13 17:45:16,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:16,361 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-10-13 17:45:16,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:45:16,361 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-13 17:45:16,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:16,363 INFO L225 Difference]: With dead ends: 46 [2019-10-13 17:45:16,363 INFO L226 Difference]: Without dead ends: 29 [2019-10-13 17:45:16,364 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 [2019-10-13 17:45:16,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-13 17:45:16,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2019-10-13 17:45:16,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-13 17:45:16,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-10-13 17:45:16,372 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 17 [2019-10-13 17:45:16,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:16,373 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-10-13 17:45:16,373 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:45:16,373 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-10-13 17:45:16,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-13 17:45:16,374 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:16,374 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:16,375 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:16,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:16,375 INFO L82 PathProgramCache]: Analyzing trace with hash -1150570790, now seen corresponding path program 1 times [2019-10-13 17:45:16,376 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:16,376 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29885928] [2019-10-13 17:45:16,376 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:16,377 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:16,377 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:16,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,503 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:45:16,503 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29885928] [2019-10-13 17:45:16,504 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117747712] [2019-10-13 17:45:16,504 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 [2019-10-13 17:45:16,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:16,573 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:45:16,584 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:16,616 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:45:16,617 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:16,617 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-13 17:45:16,617 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885895358] [2019-10-13 17:45:16,618 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:45:16,618 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:16,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:45:16,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:45:16,619 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 6 states. [2019-10-13 17:45:16,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:16,741 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2019-10-13 17:45:16,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 17:45:16,742 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2019-10-13 17:45:16,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:16,743 INFO L225 Difference]: With dead ends: 53 [2019-10-13 17:45:16,743 INFO L226 Difference]: Without dead ends: 34 [2019-10-13 17:45:16,745 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:45:16,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-13 17:45:16,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-10-13 17:45:16,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-13 17:45:16,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-10-13 17:45:16,758 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 22 [2019-10-13 17:45:16,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:16,759 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-10-13 17:45:16,759 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:45:16,759 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-10-13 17:45:16,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-13 17:45:16,761 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:16,762 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:16,967 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:16,968 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:16,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:16,969 INFO L82 PathProgramCache]: Analyzing trace with hash -1868122094, now seen corresponding path program 2 times [2019-10-13 17:45:16,969 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:16,970 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612269486] [2019-10-13 17:45:16,970 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:16,971 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:16,971 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:16,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:17,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:17,061 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-13 17:45:17,061 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612269486] [2019-10-13 17:45:17,062 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234528847] [2019-10-13 17:45:17,062 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 [2019-10-13 17:45:17,103 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:17,103 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:17,104 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:45:17,106 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:17,129 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-13 17:45:17,131 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:17,132 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-13 17:45:17,132 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281569692] [2019-10-13 17:45:17,133 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-13 17:45:17,133 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:17,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-13 17:45:17,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:45:17,134 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 7 states. [2019-10-13 17:45:17,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:17,265 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2019-10-13 17:45:17,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:45:17,265 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2019-10-13 17:45:17,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:17,266 INFO L225 Difference]: With dead ends: 62 [2019-10-13 17:45:17,266 INFO L226 Difference]: Without dead ends: 39 [2019-10-13 17:45:17,267 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:45:17,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-13 17:45:17,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2019-10-13 17:45:17,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-13 17:45:17,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2019-10-13 17:45:17,275 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 27 [2019-10-13 17:45:17,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:17,275 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2019-10-13 17:45:17,275 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-13 17:45:17,275 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2019-10-13 17:45:17,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-13 17:45:17,276 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:17,277 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:17,477 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:17,478 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:17,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:17,478 INFO L82 PathProgramCache]: Analyzing trace with hash 150752210, now seen corresponding path program 3 times [2019-10-13 17:45:17,478 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:17,479 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345292992] [2019-10-13 17:45:17,479 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:17,479 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:17,480 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:17,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:17,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:17,608 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-13 17:45:17,608 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345292992] [2019-10-13 17:45:17,608 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595661735] [2019-10-13 17:45:17,609 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 [2019-10-13 17:45:17,657 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-13 17:45:17,658 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:17,659 INFO L256 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-13 17:45:17,662 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:17,676 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-13 17:45:17,676 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:17,677 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-13 17:45:17,677 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582406980] [2019-10-13 17:45:17,678 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 17:45:17,678 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:17,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 17:45:17,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:45:17,679 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 8 states. [2019-10-13 17:45:17,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:17,805 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2019-10-13 17:45:17,806 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 17:45:17,806 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2019-10-13 17:45:17,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:17,807 INFO L225 Difference]: With dead ends: 71 [2019-10-13 17:45:17,807 INFO L226 Difference]: Without dead ends: 44 [2019-10-13 17:45:17,808 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-13 17:45:17,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-13 17:45:17,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2019-10-13 17:45:17,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-13 17:45:17,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2019-10-13 17:45:17,815 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 32 [2019-10-13 17:45:17,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:17,816 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2019-10-13 17:45:17,816 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 17:45:17,816 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2019-10-13 17:45:17,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-13 17:45:17,817 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:17,818 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:18,029 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:18,030 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:18,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:18,030 INFO L82 PathProgramCache]: Analyzing trace with hash -125121014, now seen corresponding path program 4 times [2019-10-13 17:45:18,031 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:18,031 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366249523] [2019-10-13 17:45:18,031 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:18,031 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:18,032 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:18,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:18,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:18,118 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-10-13 17:45:18,118 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366249523] [2019-10-13 17:45:18,119 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641670082] [2019-10-13 17:45:18,119 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 [2019-10-13 17:45:18,164 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:45:18,165 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:18,166 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:45:18,168 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:18,182 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-13 17:45:18,182 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:18,182 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-13 17:45:18,183 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404007095] [2019-10-13 17:45:18,183 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 17:45:18,184 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:18,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 17:45:18,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:45:18,184 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 9 states. [2019-10-13 17:45:18,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:18,286 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2019-10-13 17:45:18,286 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 17:45:18,286 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2019-10-13 17:45:18,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:18,287 INFO L225 Difference]: With dead ends: 80 [2019-10-13 17:45:18,287 INFO L226 Difference]: Without dead ends: 49 [2019-10-13 17:45:18,288 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:45:18,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-13 17:45:18,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2019-10-13 17:45:18,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-13 17:45:18,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2019-10-13 17:45:18,297 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 37 [2019-10-13 17:45:18,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:18,298 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2019-10-13 17:45:18,298 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 17:45:18,298 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2019-10-13 17:45:18,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-13 17:45:18,299 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:18,300 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:18,512 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:18,512 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:18,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:18,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1558523702, now seen corresponding path program 5 times [2019-10-13 17:45:18,513 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:18,513 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408204341] [2019-10-13 17:45:18,513 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:18,513 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:18,513 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:18,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:18,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:18,640 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-13 17:45:18,641 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408204341] [2019-10-13 17:45:18,641 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689353938] [2019-10-13 17:45:18,641 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 [2019-10-13 17:45:18,827 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-13 17:45:18,827 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:18,829 INFO L256 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 17:45:18,831 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:18,848 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-13 17:45:18,849 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:18,849 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-13 17:45:18,849 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401153408] [2019-10-13 17:45:18,850 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-13 17:45:18,850 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:18,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-13 17:45:18,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-13 17:45:18,851 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 10 states. [2019-10-13 17:45:18,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:18,991 INFO L93 Difference]: Finished difference Result 89 states and 97 transitions. [2019-10-13 17:45:18,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-13 17:45:18,991 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 42 [2019-10-13 17:45:18,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:18,992 INFO L225 Difference]: With dead ends: 89 [2019-10-13 17:45:18,992 INFO L226 Difference]: Without dead ends: 54 [2019-10-13 17:45:18,993 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-13 17:45:18,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-13 17:45:18,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-10-13 17:45:18,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-13 17:45:19,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-10-13 17:45:19,000 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 42 [2019-10-13 17:45:19,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:19,000 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-10-13 17:45:19,001 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-13 17:45:19,001 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-10-13 17:45:19,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-13 17:45:19,002 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:19,002 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:19,203 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:19,203 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:19,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:19,204 INFO L82 PathProgramCache]: Analyzing trace with hash -1349350398, now seen corresponding path program 6 times [2019-10-13 17:45:19,205 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:19,205 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203267340] [2019-10-13 17:45:19,205 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,206 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,206 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:19,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,326 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-10-13 17:45:19,326 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203267340] [2019-10-13 17:45:19,326 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982154877] [2019-10-13 17:45:19,327 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 [2019-10-13 17:45:19,448 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-13 17:45:19,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:19,449 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 17:45:19,452 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:19,472 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-13 17:45:19,473 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:19,473 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-13 17:45:19,474 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140478845] [2019-10-13 17:45:19,475 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-13 17:45:19,476 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:19,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-13 17:45:19,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:45:19,479 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 11 states. [2019-10-13 17:45:19,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:19,625 INFO L93 Difference]: Finished difference Result 98 states and 106 transitions. [2019-10-13 17:45:19,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-13 17:45:19,626 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 47 [2019-10-13 17:45:19,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:19,627 INFO L225 Difference]: With dead ends: 98 [2019-10-13 17:45:19,627 INFO L226 Difference]: Without dead ends: 59 [2019-10-13 17:45:19,628 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-13 17:45:19,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-13 17:45:19,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2019-10-13 17:45:19,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-10-13 17:45:19,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2019-10-13 17:45:19,635 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 47 [2019-10-13 17:45:19,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:19,638 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2019-10-13 17:45:19,638 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-13 17:45:19,638 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2019-10-13 17:45:19,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-13 17:45:19,639 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:19,641 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:19,845 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:19,845 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:19,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:19,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1128841790, now seen corresponding path program 7 times [2019-10-13 17:45:19,846 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:19,846 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009824113] [2019-10-13 17:45:19,846 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,846 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:19,847 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:19,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:19,995 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-10-13 17:45:19,996 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009824113] [2019-10-13 17:45:19,996 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865597073] [2019-10-13 17:45:19,996 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 [2019-10-13 17:45:20,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,046 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 17:45:20,049 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:20,073 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-10-13 17:45:20,074 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:20,074 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-13 17:45:20,074 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290873137] [2019-10-13 17:45:20,078 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 17:45:20,078 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:20,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 17:45:20,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:45:20,079 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 12 states. [2019-10-13 17:45:20,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:20,229 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2019-10-13 17:45:20,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-13 17:45:20,229 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2019-10-13 17:45:20,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:20,230 INFO L225 Difference]: With dead ends: 107 [2019-10-13 17:45:20,230 INFO L226 Difference]: Without dead ends: 64 [2019-10-13 17:45:20,231 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:45:20,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-13 17:45:20,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2019-10-13 17:45:20,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-10-13 17:45:20,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2019-10-13 17:45:20,238 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 52 [2019-10-13 17:45:20,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:20,238 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2019-10-13 17:45:20,238 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 17:45:20,238 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2019-10-13 17:45:20,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-13 17:45:20,239 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:20,240 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:20,451 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:20,451 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:20,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:20,452 INFO L82 PathProgramCache]: Analyzing trace with hash -612503046, now seen corresponding path program 8 times [2019-10-13 17:45:20,452 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:20,453 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981438191] [2019-10-13 17:45:20,453 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,454 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:20,454 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:20,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:20,601 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-10-13 17:45:20,602 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981438191] [2019-10-13 17:45:20,602 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741709276] [2019-10-13 17:45:20,602 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 [2019-10-13 17:45:20,657 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:20,658 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:20,659 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:45:20,661 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:20,693 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-10-13 17:45:20,694 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:20,694 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-13 17:45:20,694 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538185665] [2019-10-13 17:45:20,695 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-13 17:45:20,695 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:20,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-13 17:45:20,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:45:20,696 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand 13 states. [2019-10-13 17:45:20,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:20,819 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2019-10-13 17:45:20,819 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 17:45:20,820 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 57 [2019-10-13 17:45:20,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:20,821 INFO L225 Difference]: With dead ends: 116 [2019-10-13 17:45:20,821 INFO L226 Difference]: Without dead ends: 69 [2019-10-13 17:45:20,822 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:45:20,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-10-13 17:45:20,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2019-10-13 17:45:20,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-13 17:45:20,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-10-13 17:45:20,828 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 57 [2019-10-13 17:45:20,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:20,829 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-10-13 17:45:20,829 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-13 17:45:20,829 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-10-13 17:45:20,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-10-13 17:45:20,830 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:20,830 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:21,035 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:21,035 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:21,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:21,036 INFO L82 PathProgramCache]: Analyzing trace with hash -490630470, now seen corresponding path program 9 times [2019-10-13 17:45:21,036 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:21,036 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207420384] [2019-10-13 17:45:21,037 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:21,037 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:21,037 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:21,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:21,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:21,170 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-13 17:45:21,170 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207420384] [2019-10-13 17:45:21,170 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760307196] [2019-10-13 17:45:21,170 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 [2019-10-13 17:45:21,393 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-13 17:45:21,393 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:21,394 INFO L256 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-13 17:45:21,397 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:21,429 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-13 17:45:21,432 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:21,432 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-13 17:45:21,434 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715493304] [2019-10-13 17:45:21,434 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:45:21,435 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:21,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:45:21,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:45:21,437 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 14 states. [2019-10-13 17:45:21,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:21,619 INFO L93 Difference]: Finished difference Result 125 states and 133 transitions. [2019-10-13 17:45:21,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 17:45:21,619 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 62 [2019-10-13 17:45:21,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:21,621 INFO L225 Difference]: With dead ends: 125 [2019-10-13 17:45:21,621 INFO L226 Difference]: Without dead ends: 74 [2019-10-13 17:45:21,622 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:45:21,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-13 17:45:21,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2019-10-13 17:45:21,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-10-13 17:45:21,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2019-10-13 17:45:21,629 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 62 [2019-10-13 17:45:21,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:21,630 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2019-10-13 17:45:21,630 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:45:21,630 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2019-10-13 17:45:21,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-13 17:45:21,632 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:21,632 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:21,841 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:21,842 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:21,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:21,843 INFO L82 PathProgramCache]: Analyzing trace with hash -1207107598, now seen corresponding path program 10 times [2019-10-13 17:45:21,843 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:21,843 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508413212] [2019-10-13 17:45:21,844 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:21,844 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:21,844 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:21,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:21,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:21,998 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2019-10-13 17:45:21,998 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508413212] [2019-10-13 17:45:21,999 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514370550] [2019-10-13 17:45:21,999 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 [2019-10-13 17:45:22,059 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:45:22,059 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:22,060 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:45:22,063 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:22,085 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2019-10-13 17:45:22,085 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:22,085 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-13 17:45:22,086 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431924898] [2019-10-13 17:45:22,086 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-13 17:45:22,086 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:22,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-13 17:45:22,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:45:22,087 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 15 states. [2019-10-13 17:45:22,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:22,271 INFO L93 Difference]: Finished difference Result 134 states and 142 transitions. [2019-10-13 17:45:22,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 17:45:22,271 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 67 [2019-10-13 17:45:22,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:22,272 INFO L225 Difference]: With dead ends: 134 [2019-10-13 17:45:22,273 INFO L226 Difference]: Without dead ends: 79 [2019-10-13 17:45:22,273 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:45:22,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-13 17:45:22,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2019-10-13 17:45:22,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-10-13 17:45:22,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2019-10-13 17:45:22,280 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 67 [2019-10-13 17:45:22,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:22,280 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2019-10-13 17:45:22,280 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-13 17:45:22,280 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2019-10-13 17:45:22,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-10-13 17:45:22,282 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:22,282 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:22,485 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:22,485 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:22,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:22,486 INFO L82 PathProgramCache]: Analyzing trace with hash 2083114930, now seen corresponding path program 11 times [2019-10-13 17:45:22,486 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:22,486 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065525780] [2019-10-13 17:45:22,487 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,487 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:22,488 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:22,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:22,635 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2019-10-13 17:45:22,635 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065525780] [2019-10-13 17:45:22,635 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800130165] [2019-10-13 17:45:22,635 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 [2019-10-13 17:45:41,763 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-13 17:45:41,764 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:41,782 INFO L256 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 17:45:41,784 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:41,804 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2019-10-13 17:45:41,805 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:41,805 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-13 17:45:41,805 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660460260] [2019-10-13 17:45:41,806 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-13 17:45:41,806 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:41,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-13 17:45:41,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:45:41,807 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 16 states. [2019-10-13 17:45:41,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:41,979 INFO L93 Difference]: Finished difference Result 143 states and 151 transitions. [2019-10-13 17:45:41,980 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 17:45:41,980 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 72 [2019-10-13 17:45:41,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:41,981 INFO L225 Difference]: With dead ends: 143 [2019-10-13 17:45:41,981 INFO L226 Difference]: Without dead ends: 84 [2019-10-13 17:45:41,982 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-13 17:45:41,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-10-13 17:45:41,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2019-10-13 17:45:41,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-13 17:45:41,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2019-10-13 17:45:41,988 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 72 [2019-10-13 17:45:41,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:41,988 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2019-10-13 17:45:41,988 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-13 17:45:41,988 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2019-10-13 17:45:41,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-13 17:45:41,989 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:41,990 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:42,198 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:42,199 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:42,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:42,200 INFO L82 PathProgramCache]: Analyzing trace with hash 385857002, now seen corresponding path program 12 times [2019-10-13 17:45:42,200 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:42,200 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48231557] [2019-10-13 17:45:42,201 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:42,201 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:42,201 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:42,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:42,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:42,364 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-13 17:45:42,364 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48231557] [2019-10-13 17:45:42,365 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817225368] [2019-10-13 17:45:42,365 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 [2019-10-13 17:45:55,867 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-13 17:45:55,868 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:55,878 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 17:45:55,880 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:55,910 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-10-13 17:45:55,910 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:55,910 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-13 17:45:55,911 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828853394] [2019-10-13 17:45:55,911 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-13 17:45:55,911 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:55,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-13 17:45:55,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:45:55,913 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand 17 states. [2019-10-13 17:45:56,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:56,056 INFO L93 Difference]: Finished difference Result 152 states and 160 transitions. [2019-10-13 17:45:56,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-13 17:45:56,057 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 77 [2019-10-13 17:45:56,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:56,058 INFO L225 Difference]: With dead ends: 152 [2019-10-13 17:45:56,058 INFO L226 Difference]: Without dead ends: 89 [2019-10-13 17:45:56,058 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-13 17:45:56,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-13 17:45:56,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2019-10-13 17:45:56,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2019-10-13 17:45:56,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2019-10-13 17:45:56,065 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 77 [2019-10-13 17:45:56,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:56,065 INFO L462 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2019-10-13 17:45:56,065 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-13 17:45:56,065 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2019-10-13 17:45:56,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-10-13 17:45:56,066 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:56,067 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:56,267 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:56,267 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:56,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:56,268 INFO L82 PathProgramCache]: Analyzing trace with hash 1239413930, now seen corresponding path program 13 times [2019-10-13 17:45:56,268 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:56,268 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223655202] [2019-10-13 17:45:56,268 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:56,268 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:56,269 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:56,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,470 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2019-10-13 17:45:56,470 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223655202] [2019-10-13 17:45:56,470 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238482923] [2019-10-13 17:45:56,470 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 [2019-10-13 17:45:56,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:56,541 INFO L256 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 17:45:56,543 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:56,562 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2019-10-13 17:45:56,562 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:56,562 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-13 17:45:56,563 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84639129] [2019-10-13 17:45:56,563 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-13 17:45:56,563 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:56,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-13 17:45:56,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:45:56,564 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 18 states. [2019-10-13 17:45:56,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:56,764 INFO L93 Difference]: Finished difference Result 161 states and 169 transitions. [2019-10-13 17:45:56,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 17:45:56,765 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 82 [2019-10-13 17:45:56,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:56,766 INFO L225 Difference]: With dead ends: 161 [2019-10-13 17:45:56,766 INFO L226 Difference]: Without dead ends: 94 [2019-10-13 17:45:56,767 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:45:56,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-10-13 17:45:56,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2019-10-13 17:45:56,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-13 17:45:56,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 95 transitions. [2019-10-13 17:45:56,773 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 95 transitions. Word has length 82 [2019-10-13 17:45:56,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:56,773 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 95 transitions. [2019-10-13 17:45:56,773 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-13 17:45:56,773 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 95 transitions. [2019-10-13 17:45:56,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-13 17:45:56,774 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:56,775 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:56,980 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:56,980 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:56,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:56,981 INFO L82 PathProgramCache]: Analyzing trace with hash -535424030, now seen corresponding path program 14 times [2019-10-13 17:45:56,981 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:56,981 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566149215] [2019-10-13 17:45:56,981 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:56,981 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:56,982 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:57,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:57,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:57,200 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-10-13 17:45:57,201 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566149215] [2019-10-13 17:45:57,201 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686176914] [2019-10-13 17:45:57,201 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 [2019-10-13 17:45:57,273 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:45:57,273 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:45:57,274 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-13 17:45:57,277 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:45:57,300 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-10-13 17:45:57,306 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:45:57,306 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-13 17:45:57,308 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846298183] [2019-10-13 17:45:57,309 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-13 17:45:57,309 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:45:57,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-13 17:45:57,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:45:57,310 INFO L87 Difference]: Start difference. First operand 92 states and 95 transitions. Second operand 19 states. [2019-10-13 17:45:57,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:45:57,581 INFO L93 Difference]: Finished difference Result 170 states and 178 transitions. [2019-10-13 17:45:57,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-13 17:45:57,581 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 87 [2019-10-13 17:45:57,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:45:57,582 INFO L225 Difference]: With dead ends: 170 [2019-10-13 17:45:57,582 INFO L226 Difference]: Without dead ends: 99 [2019-10-13 17:45:57,583 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:45:57,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-10-13 17:45:57,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2019-10-13 17:45:57,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-10-13 17:45:57,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2019-10-13 17:45:57,588 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 87 [2019-10-13 17:45:57,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:45:57,588 INFO L462 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2019-10-13 17:45:57,588 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-13 17:45:57,589 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2019-10-13 17:45:57,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2019-10-13 17:45:57,590 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:45:57,590 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:45:57,799 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:45:57,799 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:45:57,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:45:57,800 INFO L82 PathProgramCache]: Analyzing trace with hash -422313566, now seen corresponding path program 15 times [2019-10-13 17:45:57,800 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:45:57,800 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553603005] [2019-10-13 17:45:57,800 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:57,801 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:45:57,801 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:45:57,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:57,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:45:57,997 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2019-10-13 17:45:57,997 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553603005] [2019-10-13 17:45:57,997 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721421225] [2019-10-13 17:45:57,997 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 [2019-10-13 17:46:00,287 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-13 17:46:00,287 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:46:00,291 INFO L256 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-13 17:46:00,293 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:46:00,337 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2019-10-13 17:46:00,337 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:46:00,338 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-13 17:46:00,338 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501913611] [2019-10-13 17:46:00,338 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-13 17:46:00,338 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:46:00,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-13 17:46:00,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-13 17:46:00,339 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 20 states. [2019-10-13 17:46:00,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:46:00,565 INFO L93 Difference]: Finished difference Result 179 states and 187 transitions. [2019-10-13 17:46:00,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-13 17:46:00,566 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 92 [2019-10-13 17:46:00,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:46:00,567 INFO L225 Difference]: With dead ends: 179 [2019-10-13 17:46:00,568 INFO L226 Difference]: Without dead ends: 104 [2019-10-13 17:46:00,569 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-13 17:46:00,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-10-13 17:46:00,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 102. [2019-10-13 17:46:00,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2019-10-13 17:46:00,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 105 transitions. [2019-10-13 17:46:00,574 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 105 transitions. Word has length 92 [2019-10-13 17:46:00,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:46:00,575 INFO L462 AbstractCegarLoop]: Abstraction has 102 states and 105 transitions. [2019-10-13 17:46:00,575 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-13 17:46:00,575 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 105 transitions. [2019-10-13 17:46:00,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-10-13 17:46:00,576 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:46:00,576 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:46:00,783 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:46:00,783 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:46:00,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:46:00,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1861215782, now seen corresponding path program 16 times [2019-10-13 17:46:00,784 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:46:00,784 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476681356] [2019-10-13 17:46:00,785 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:46:00,785 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:46:00,785 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:46:00,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:46:01,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:46:01,024 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2019-10-13 17:46:01,024 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476681356] [2019-10-13 17:46:01,025 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390255807] [2019-10-13 17:46:01,025 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 [2019-10-13 17:46:01,088 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:46:01,088 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:46:01,089 INFO L256 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-13 17:46:01,091 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:46:01,113 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-10-13 17:46:01,114 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:46:01,114 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-13 17:46:01,114 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938520644] [2019-10-13 17:46:01,115 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-13 17:46:01,115 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:46:01,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-13 17:46:01,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:46:01,116 INFO L87 Difference]: Start difference. First operand 102 states and 105 transitions. Second operand 21 states. [2019-10-13 17:46:01,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:46:01,291 INFO L93 Difference]: Finished difference Result 188 states and 196 transitions. [2019-10-13 17:46:01,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-13 17:46:01,292 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 97 [2019-10-13 17:46:01,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:46:01,293 INFO L225 Difference]: With dead ends: 188 [2019-10-13 17:46:01,293 INFO L226 Difference]: Without dead ends: 109 [2019-10-13 17:46:01,294 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:46:01,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2019-10-13 17:46:01,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2019-10-13 17:46:01,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2019-10-13 17:46:01,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2019-10-13 17:46:01,298 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 97 [2019-10-13 17:46:01,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:46:01,299 INFO L462 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2019-10-13 17:46:01,299 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-13 17:46:01,299 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2019-10-13 17:46:01,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-10-13 17:46:01,300 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:46:01,300 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:46:01,500 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:46:01,501 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:46:01,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:46:01,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1207301786, now seen corresponding path program 17 times [2019-10-13 17:46:01,502 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:46:01,502 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178062936] [2019-10-13 17:46:01,502 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:46:01,503 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:46:01,503 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:46:01,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:46:01,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:46:01,727 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2019-10-13 17:46:01,727 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178062936] [2019-10-13 17:46:01,727 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574004641] [2019-10-13 17:46:01,727 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